A man recognized as a genius scientist, a "worthy rival" of the King of Inventors Edison, who "controlled electromagnetism" from the 19th centuryWP to 20th centuryWP. Recognized as a "prodigy without equal" and the "Modern Prometheus", he was one of the great scholars who "clarified the power of thunder and lightning", previously described in various mythologies as a "legend of god." The "man who revealed Zeus' thunder to the world", he brought about "electricity" to human civilization.
Tesla was recognized by others as a "peerless handsome man."
Dubbed as the "Professor Thunder and Lightning" by Mark TwainWP, Archer is a haughty individual recognized as a "devil of fierce and magnificent intellect." His wish upon the Holy Grail is "to complete the Nikola Tesla World System", to bring about the "advent of a new world in which interacting electric currents come and go in space itself." He is willing to spare no efforts in the restoration of human history for the sake of that wish.
Fourth Singularity: London
Tesla is summoned by Makiri Zolgen from the Demonic Fog, which finished the ritual after Mordred killed the former. His summoning released a massive burst of magical energy that knocked Ritsuka, Mash, and Mordred unconscious. Tesla automatically heads for the surface to fully activate the fog to destroy the era thanks to Makiri adding the line for Mad Enhancement. When the group catches up to him, he reveals the activated fog absorbs magical energy without limit. He also warns it could possibly absorb their Spirit Cores if they approach. Mordred uses Clarent Blood Arthur to temporarily disperse the fog so they can fight him. Tesla deduces her identity upon recognizing Clarent. He then decides to destroy every Heroic Spirit of the Heaven and Earth attributes, saying only Heroic Spirits of the Human and the Star attributes should exist beyond the age of electricity. The group fight him, but they’re forced to retreat when the fog returns. Tesla tells the group he is heading to where the fog is thickest, the skies above Buckingham Palace. He explains a lightning strike from him will fully activate the fog and implores they stop him before he does.
Upon arriving at the surface, Tesla creates a stairway to the sky when Sakata Kintoki arrives. He confirms Kintoki's deduction that the era will be destroyed if he reaches the sky. He realizes the former was summoned from the fog, with the lightning acting as the catalyst. He prepares to fight him when Tamamo-no-Mae suddenly appears. He tells her to fall back, but she stays to fight him with Kintoki. During the fight, Tesla is impressed by how long Kintoki has lasted in the activated fog. But he also points out that his Spirit Core won’t last much longer. By the time Ritsuka, Mash, and Mordred, Tesla has already ascended his stairway. The group is able to defeat him thanks to Kintoki dispersing the activated fog. He disappears commending them their victory.
Event: Saber Wars
Tesla, Sakata Kintoki, and Charles Babbage locate Mysterious Heroine X's ship, having been told it's a source of evil by a voice from a lens that fell from the sky. Tesla dislikes that the ship doesn't require electricity, believing such technology shouldn't exist. X mistakes him for Captain☆Nikola. Tesla corrects her and asks if there is a genius of his caliber in the Servant Universe. X is confused and asks him if he is not Captain☆Nikola, the rival of the Dark Doctor, Sanity Gilles. Tesla takes this to mean that he has been proven to be a universal genius. He, Kintoki, and Babbage fight Ritsuka's party after EMIYA asks Artoria Lily to demonstrate how she has improved. After the fight, Tesla asks X if his name is not Doctor Lightning in her universe. X answers it's always been, Captain☆Nikola. Tesla disappears disappointed.
Fifth Singularity: E Pluribus Unum
As the American north army struggle against Clan Calatin, Tesla arrives to help them to atone for his actions in London, much to Thomas Edison's dismay. Realizing their attacks are effective, Tesla and Edison unleash their Noble Phantasms simultaneously to seal Clan Calatin off. Arjuna then arrives and sacrifices himself to launch a restricted Pashupata to destroy Clan Calatin. Edison and Tesla start fighting each other.
After the Singularity is resolved, Tesla tells Edison that he encounters needless troubles because he blindly rushes toward challenges without understanding theories. Edison refutes this by calling out Tesla's empty theories. After Helena Blavatsky disappears, Edison and Tesla express their surprise at them joining forces. After Edison disappears, Tesla is irritated that he reached the same conclusion as him, hoping they'll be summoned as proper Servants of Ritsuka. He then disappears knowing him summoned first is based on luck.
Final Singularity: Solomon
He is amongst the "London" Singularity Servants who assist Chaldea against the Demon Gods Pillars of the Control Tower.
Lostbelt No.5: Olympus
Tesla was the leader of the Servant resistance against the gods in the Greek Lostbelt, but he died before Chaldea reached Olympus. He set up an AI modeled after his personality to assist Chaldea once they arrived.
GUDAGUDA Meiji Restoration
Meeting with Nobukatsu at Ikedaya Inn at night, Edimori and Tesla argue about whose company is better for mass production. Nobukatsu convinces them to join forces for the sake of their common goal, forming the SatChou Alliance. Okita Souji and Ritsuka then burst into the room, prompting Nobukatsu to escape. Outside the inn, Oda Nobunaga and Chacha prepare to punish Nobukatsu for conspirig to usurp Nobunaga's position as head of the Oda. Tesla, however, attacks them with Nobbu UFOs, allowing Nobukatsu to escape. Chacha and Nobunaga eventually destroy the UFOs, so Tesla surrenders to them. They join up with Ritsuka, Okita, and Hijikata Toshizou, who just captured Edimori. However, the two inventors flashbang the group, and escape while Nobunaga and Hijikata argue. While escaping, Edimori reveals his factory in Toba is producing tens of thousands of Mecha Nobbu, and Tesla reveals his company in Fushimi is testing a powerful weapon.
The next day at Tobi-Fushimi, Tesla and Edimori has amassed an army of Mecha Nobbus and Nobbu UFOS. Ritsuka's party destroys their army and defeats the two inventors. Tesla disappears lamenting all their work was for nothing.
Event: All the Statesmen!
Tesla was summoned by the Nameless Master and is presumably why the Columbian Exposition runs on AC. He and Altera (calling herself Davy Crockett) encounter Ritsuka's party when they come to the fair. A fight quickly ensues thanks to Altera sending Edison into a rage by calling DC bad civilization.
Tesla is defeated, leaving him to wonder why the World's Fair's power engine, the Allis Engine, stopped. Nursery Rhyme tells him unpredictable things can happen anywhere, at any time. That is the basis of storytelling, and in the good ones, coincidence trumps reality. Tesla decides to take Nursery Rhyme's words into account in future theories, so it can't be said AC lost to DC. He then disappears, wishing Ritsuka's party good luck on the rest of their journey.
Summer Event: Dead Heat Summer Race!
Edison and Tesla's argument over which one of them won last year's barbecue contest quickly devolves into a fight. Helena stops their fighting and sends them out of the room. Edison and Tesla return to the room as Helena mumbles to herself, thinking Ritsuka is calling her a fraud like the SPR did in life. Her mumbling soon evolves into a nervous breakdown about how everyone criticized her about Mahatma. Edison and Tesla both agree that they're partially to blame for Helena's current state, but they also know it's mostly Sherlock Holmes' fault. Tesla searches for Sherlock with his radio waves, but the detective is already gone. The inventors then cooperate to remind her not to respond to every criticism with anger, saying they only want her to be happy. Their words and Ritsuka's apology almost bring Helena out of her spout of depression, but Edison and Tesla realize she needs something to forget her troubles. They then see a flyer for Ishtar's race and suggest to Helena that she take part. Helena, now feeling better, accepts and uses Mahatama Change to instantly change into a swimsuit and class change into an Archer. She is worried, though, about her partner since her Kumara Wheel only seats one person. Edison and Tesla decide to be her partners and build her a custom vehicle. They then start arguing about what electric current it will use until Helena suggests it use both.
At the racetrack, Tesla, noting the fired up Helena, hopes Ritsuka can understand that she needs to let off some steam from time to time. Ishtar then shows everyone the ritual tools, which are key to erasing the Singularity, and indicates a team is a legit participant. They’re designed to integrate into the vehicles, and any vehicle trying to race without them is automatically disqualified. After commentary on each team from Ishtar, the race begins.
A group of thugs soon appear before the racers. After the thugs are defeated, their leader, Atalanta, arrives. She considers the thugs to be her children to the racers’ confusion. Calling the wasteland the Atalanta Plains, she tells the racers that its roads lead to where she and her children planted Seed Apples. They are essential to her children‘s future, so she cannot permit them to be destroyed in the race. Everyone ignores her but soon learns she planted land mines to protect the seed apples. Atalanta is eventually defeated, and the racers move on to the next area.
The race brings everyone to an active volcano, where they meet Boudica at its crater. She offers to cook them something, only to turn hostile. Her hostility is due to what happened to Britannia and the fact she doesn’t have a playable swimsuit version this year despite modeling in one last year. She has become an Avenger, believing she must utterly break the racers’ spirits to protect her homeland. She will do so through a game of chicken to the mouth of the volcano, setting it up so the racers can’t cross the volcano until they beat her. The racers accept her challenge. Helena realizes something, but Edison and Tesla interrupt her and argue about which one of them she should ditch in the volcano. Helena demands they stop, saying their antics distracted from realizing how strange the volcano is. She then explains that volcanoes have been believed to hold mystical power since ancient times. Edison stops Tesla from trying to give a scientific explanation about the lights frequently spotted nearby when a volcano is on the verge of erupting. A light then flies past that Helena presumably believes is related to Mahatma. But Tesla is sure it was a drone for broadcasting the race.
Eventually, the racers arrive at a river. Penthesilea appears and explains the more beautiful they are, the faster they will go. She introduces them to the judges: Mister B, who judges their personal beauty, and Leonardo da Vinci, who judges their vehicles’ beauty. Edison and Tesla have Helena change into her one-piece swimsuit from last year. Mister B gives a positive reaction, therefore granting Helena's team a boost in speed. Frankenstein's team also gets a speed boost. While the other teams beat up Mister B (who turns out to be Blackbeard in disguise) for his double standards, Frankenstein and Helena's teams become neck in neck in the race. But near the end of the course, they see Penthesilea, who swam all the way there. Given the course's rules, Penthesilea believes her beauty gave her a boost in speed. Refusing to be considered thus, she tries to force the teams back to the start. Frankenstein and Helena's teams defeat her and continue the race. Edison and Tesla agree to give rHelena shoulder massage with their AC/DC apparatus.
The racers soon enter the fourth area, which has breast-shaped hills. Artemis and her copies fire upon them, warning they cannot go through Artemis Valley as they please. She will allow them to pass if they can find the real Orion among his copies and return him to her.
Afterward, the racers reach the final area, a bridge over a large ravine, with the Ishtar Temple at the finish line. With victory on the line, Helena has Edison and Tesla activate their vehicle's ultra acceleration feature. However, everyone is sent plummeting when someone cuts down the bridge.
Summer Event: Death Jail Summer Escape
The racers find themselves at the bottom of the ravine. They’re attacked by the Hessian Lobo security system, which overwhelms them. Medb then arrives and arrests the racers for placing weird textures on her land without permission. The racers fall unconscious and wake up in Medb’s prison. They find out that their powers are negated within prison. Medb tells the racers that she locked their vehicles up somewhere outside the prison after sensing a strange power from them. The racers are then brought to their cells, where they soon meet Ishtar’s avatars. They then encounter Carmilla working as a prison guard. Carmilla determines they're too weak to escape and opens their cells.
In the courtyard, the racers meet Gorgon, who's only brought out of solitary confinement for exercise. She agrees to tell them about the prison if they help with her exercise. However, the fight is soon interrupted by Florence Nightingale, who leaves after Gorgon says none of them are injured. Minamoto-no-Raikou deduces Gorgon is a projection of her real self inside her cell. Gorgon confirms this then reveals it's impossible to destroy the prison’s barrier from either the outside or the inside. However, the racers can take advantage of Medb’s overconfidence in her Prison Field to find blind spots to escape. Carmilla then brings the racers back to their cells.
The next day, the racers still haven’t found an escape route. They see Quetzalcoatl training other prisoners to be luchadors After some sparring, the racers are sent back to their cells. They then follow Ritsuka’s advice to dig their way out of the prison.
However, the racers' tunnels all converge onto Gorgon's cell, chained there by divine steel. Gorgon agrees to help them escape if they defeat Nightingale, who's about to spray her with reptile sanitizer. After Nightingale is defeated, Nero Claudius determines they can use Gorgon’s acid to clear any obstacles that bar them while digging. Since they had a deal, Gorgon spews acid into special containers for each team.
Unfortunately, while digging, they discover the Prison Field extends underground. They return to Gorgon's cell, who seems to be enjoying their predicament. After venting their frustrations, the racers realize they have no choice but to kill Medb to disable the Prison Field. Gorgon reveals there was another prisoner who tried escaping by killing Medb. She defeated them and revealed she has a conceptual weakness to projectile cheese. But Medb is always protected by her warriors. Gorgon reveals Medb always takes a shower in her warden’s office at the same time every day. James Moriarty, Edison, and Tesla point out they need someone intelligent as them and Charles Babbage, who also knows the prison’s layout if they want to successfully snipe Medb from outside her bathroom window. Gorgon reveals there is a prisoner who knows everything about the prison, despite being in solitary confinement. She then gives the racers general directions to that person's cell.
They dig into the prisoner’s cell, who turns to be Enkidu in tight restraints. After Raikou cuts their restraints, Enkidu has the racers spar with them to see if they’re fully functional. Enkidu afterward then agrees to provide the racers with the necessary calculations. Carmilla arrives to feed them, and attacks everyone after seeing Enkidu unrestrained. After defeating Carmilla, Enkidu, Babbage, Edison, and Tesla make blueprints for their cheese-apult.
After building it with the materials Ritsuka provided, the racers use the cheese-apult to assassinate Medb while she’s in the shower. However, Medb kicks the cheese away thanks to training her body to automatically react to incoming cheese. Enkidu reveals there is another way to remove the Prison Field, one only they know of. They reveal the control device for the Prison Field is a stone above the ground. The racers soon realize it’s in the statue of Medb in the courtyard. Enkidu then reveals there is a prisoner who is master of disguise that the racers can use to trick Quetzalcoatl into disabling the Prison Field. The racers then dig their way to the prisoner’s cell.
They arrive in the prisoner's cell, only to find Carmilla there to their shock. They fight her, but in the midst of it, she turns into Nightingale. After being defeated, she reveals herself to be Yan Qing in disguise. He agrees to disguise himself as Medb to trick Quetzalcoatl into disabling the Prison Field in exchange for fighting him. But Raikou has him sit in the corner and lectures him until he gets sore. Afterward, Yan Qing (disguised as Med) gets Quetzalcoatl to disable the barrier underground, allowing the racers to reach their vehicles in the warehouse.
The racers escape to the outside. Tesla feels it's best for Helena not to recall vague memories of being in a subterranean world before, not wanting to cause her undue stress. Medb and Quetzalcoatl then confront the racers. Medb deflects shots from X's cheese blaster and decides to execute the racers, accusing them of covering Connacht with textures of another place. The racers defeat Medb and Quetzalcoatl, then return to the race once they disappear.
If Helena's team is in the lead, Helena orders Edison and Tesla to put the Thunderdome (calling it the Hierarchy Engine) to full power. Tesla assumes Hierarchy Engine refers to a mystical engine bestowed by Mahatma. Helena admits she only said it because it sounded cool, and her vehicle doesn't have an actual engine. Tesla then prepares to overcharge the Thunderdome, but Edison is concerned that will launch Helena into enemy territory. Helena tells them to stop bickering but thanks them for their help. She says they'll meet again after she crosses the finish line as she is launched at high speeds.
After the race, however, an enormous storm moves toward the track as if it has a will of its own. Ishtar reveals this was her plan. Unbeknownst to the racers, their vehicles’ tires were carving magical energy into the Venus textures she placed on the land. She then reveals her temple to be a giant ATM called the Ishtar Quantum Power System. The racers confront her when the relics she had them install in their vehicle are suddenly removed. The relics converge at the Ishtar QPS, which gathers the magical energy expended in the race. At the same time, the relics were storing the heat created by the friction of the racers’ tires running across the Venus textures for each relic to reach an excited state. The purpose of all this was for Ishtar to create a new Gugalanna. After using the relics and the Ishtar QPS to do so, she declares she can use him to destroy the Singularity. Da Vinci points that would work, but it’d also destroy Connacht. The racers then fight Ishtar and Gugalanna before he’s completely formed, but they struggle against him. Quetzalcoatl then arrives to attack Gugalanna, revealing the her that disappeared before was Yan Qing in disguise. After she destroys Gugalanna, the racers and the race’s administrative staff get their picture taken by Georgios.
If Helena's team won, Edison and Tesla are glad to see Helena so happy. Both agree that her smile is brighter than any direct or alternating current. Helena thanks them both for their hard work. Then, returning to Chaldea, she notes how the hectic nature of the race reminds her of her carefree days before founding the Theosophy Association. She thanks Edison and Tesla once again for their help, but she wonders how to use their winnings. Edison and Tesla use the money to modify the Kumara Wheel into the Crimson Thunderwheel as a token of appreciation for everything Helena does for them. Helena decides to take it for a test drive and orders the inventors to get into the Thunderdome, even though they designed it to function without support.
Valentine Event The Bountiful Chocolate Gardens of Valentine
Tesla infiltrates Edison's chocolate factory at night and changes its power system from DC to AC. He then switches the operation manuals with his own, with each page having the letters “A” and “C” bolded. Anyone reading it will be subtly guided to the conclusion that the factory should be run on AC. A choco-golem then grabs Tesla, but he is able to destroy it. Edison appears and calls on more, explaining they are his employees created by Semiramis. He and Tesla then fight until Semiramis comes out and yells at them for disrupting her sleep. However, she becomes curious about who can produce more electric power. To determine this, she will provide them each a separate factory for them to power at the same time. Each will have the same number of golems, with the only difference being the power they provide. Semiramis will determine which is superior by seeing which produces more chocolate. Edison and Tesla accept, so Semiramis has the golems bring the inventors to their separate factories.
Tesla, Ritsuka, and Mash travel to London to save the world. He explains there is something in the era that'll become a disaster if left alone. The group near the British Museum when an autonmous grimoire emerges from it, despite the Demonic Fog being nearly gone. Tesla reveals there is an evil being awakened within the gap of the era's restoration. After destroying the grimoire, the group proceed to destroy the demon that manifested. Tesla then considers doing more fieldwork.
Nikola Tesla is a formidable Servant as after he was summoned in the London Singularity, Dr. Roman confirmed that he was receiving a great hero-class magical response. Nikola Tesla qualifies for the Archer-class due to having brought about what can be called the "second coming of gods of thunder and lightning", sublimated as his Noble Phantasm, System Keraunos. As it was previously a power only endowed by beings from the Age of Gods, Archer raising civilization by making it available to all is seen as a turning point in human history, granting him the high EX rank of the Pioneer of the Stars skill. Archer can use his lightning for a number of things, such as making stairs that he, and others, can walk on. 
Tesla has also been shown to be capable of holding his own against multiple servants at once, such as when he fought Mordred and Mash and later on Sakata Kintoki and Tamamo-no-Mae, who had 2 tails at the time. It took Mordred's own lighting to surpass Tesla's Noble Phantasm, defeating him in the process.
In the North American Singularity, Tesla wasn't in possession of a Holy Grail but he still boasted amazing power. Not only did he claim that he had higher power output than Edison, to which he agreed, but his Noble Phantasm alongside Edison's was able to momentarily seal Clan Calatin. Once the battle was concluded, he even claimed that had he had full power, he could have blown up the whole continent, to what Edison claimed he could argue against it if he wanted to but he didn't because he was in an extremely good mood.
- Independent Action (B Rank): It is possible for a Servant to stay in the world for two days without a Master. However, this is the ideal value achieved by maximally conserving mana and avoiding battle and Noble Phantasm usage.
- Magic Resistance (C Rank): Cancel spells with a chant below two verses. Cannot defend against magecraft on the level of greater magecraft and Greater Rituals.
- Galvanism (A Rank): By instantly converting attacks without form such as magic light, magic wind, and magic bullets into electricity and charging it, Tesla can recharge his own mana.
- Inherent Wisdom (A→EX): A Skill that shows one who has unparalleled natural knowledge. Allows the use of most Skills, excluding those inherent to the body (such as Divinity) or ones unique to particular heroes, at proficiency of A~B Rank. Nikola Tesla does not use this Skill very often.
- Pioneer of the Stars (EX Rank): Tesla brought an existence that belonged only to beings from the Age of Gods down to Earth and raised the level of civilization on the entire world, thus having this Skill at a high rank.
Creation and Conception
Namaniku ATK is the character designer for Archer.
- Fate/Grand Order - London: The Death World in the City of Demonic Fog, Section 12: Myth of Thunder and Lightning
- Fate/Grand Order - London: The Death World in the City of Demonic Fog, Section 13: Beyond the Fog
- E Pluribus Unum: The Grand Battle of Legends in North America, Section 22: Shielder, Master, Soldier, Nurse
- Fate/Grand Order - GUDAGUDA Meiji Restoration, Section 3: GUDAGUDA Idekaya Tumble
- Fate/Grand Order - GUDAGUDA Meiji Restoration, Section 4: Universal Battle of Toba-Fushimi
- Fate/Grand Order - GUDAGUDA Meiji Restoration, End Section: We Won! The The Oda Shogunate Finishes!/Key to Victory is Shinsengumi!
- Fate/Grand Order - London: Section 11 Angrboda
- Fate/Grand Order Profile of Nikola Tesla, translated by Master of Chaos at Beast's Lair.
- Fate/Grand Order material III: section on Nikola Tesla's System Keraunos Noble Phantasm, translated by ckxuZHx89 at /fgog.
- Fate/Grand Order - London: Section 12 Myth of Thunder and Lightning
- Fate/Grand Order - London: Section 13 Beyond the Fog
- Fate/Grand Order - E Pluribus Unum: Section 21 North American Myth War (Ending)