Child-Gil (子ギル, Ko-Giru?) is the youthful form Gilgamesh takes upon drinking the potion of youth from the Gate of Babylon. He is an Archer-class Servant summoned by Ritsuka Fujimaru of the Grand Order conflicts of Fate/Grand Order.
As a child, he was considered to be a king with aptitude for ruling superior to all others, the "epitome of the ideal boy king." Although Enkidu was created to reprimand Gilgamesh while he was still a child, Enkidu was not allowed to combat Gilgamesh until they could fight as equals. As Enkidu watched the young king, he could not understand what flaw he could possess that would require correction, but he witnessed the change firsthand as Gilgamesh grew. Changing into a despot who caused the masses to lament, Enkidu was presented with a reason to confront him.
Child-Gil possesses the same blood-red eyes and golden hair that makes his older-self stand out from others. Shirou is unable to identify him from sight at first in comparison to his older self, and he finds it hard to believe they are the same person even after being told, though this is more due to their great differences in personality.
In contrast to his older self, Child-Gil was praised and lauded by the citizens of Uruk to the point of infatuation as tolerant, sage, fair, and moral. The only "flaw" that could be described at the point is that he respected the gods without submitting to them.
Adult Gilgamesh declares Child-Gil and his adult self to be fundamentally different, much to the point where he speaks of his childhood self in a secondhand manner. His adult self cannot perceive the memories of his younger self despite an otherwise flawless memory, and he believes Child-Gil to be the same in nature. Gilgamesh says Child-Gil very well may have stopped his growth, or even committed suicide, had he known how his adulthood-self would act. In Fate/Grand Order, when asked the thing he hated, he becomes reproachful to his Master but answers that it is his adult self and sadly wonders why he becomes like that.
Fundamentally, a polite and modest boy. His type of woman goes along the lines of a "flower that blooms in the wild". Although he attained a piece of the truth regarding the demise of human history, he won't say a thing to his master. He only watches over the Master's fight and smiles.
Child-Gil does not appear in Fate/stay night, but it is mentioned that during the intervening years between the Fourth Holy Grail War and the Fifth Holy Grail War that Gilgamesh took the potion of youth to allow him to live in modern society without causing a problem.
Gilgamesh utilizes his child form for much of Fate/hollow ataraxia to act low-profile in Fuyuki City and avoid interacting with previous Servants or Masters.
Child-Gil is rather popular with other children. Even Shirou is rather fond of him.
It is not clear if his adult self became younger by eating the miracle drug of rejuvenation, or if he had manifested in the form of his younger days from the beginning. It is believed that what is acting as the model for his mentality is the heart from when he was called a wise ruler in the past.
Amakusa Shirou Trial Quest
Gilgamesh and Amakusa Shirou Tokisada are fighting over who gets the Pseudo-Grail. However, neither can surpass the other since Gilgamesh is the strongest Heroic Spirit and Amakusa Shirou is a Ruler. They both note that it'd be easier if Astolfo was an ally, but Astolfo dislikes them both. The two then decide to continue their fight when Astolfo arrives and announces he brought a Master.
Gilgamesh and Amakusa Shirou realize Ritsuka can choose who gets the Pseudo-Grail once they know their reasons for wanting it. Astolfo isn't interested in the Pseudo-Grail, so this competition is just between Amakusa Shirou and Gilgamesh. Gilgamesh explains he wants Pseudo-Grail so he can seal away such a potentially dangerous object. After Amakusa Shirou gives his reason, Romani Archaman reveals the Pseudo-Grail is now at risk of becoming a real one. He, therefore, feels it'd be dangerous for Ritsuka to give the Grail to a Servant they're not contracted with. Ritsuka decides they'll take the Grail themselves, prompting a fight between the group and Amakusa Shirou and Gilgamesh.
After the battle, however, Romani reports the Psuedo-Grail is summoning Shadow Servants. For this reason, Amakusa Shirou and Gilgamesh realize the Psuedo-Grail is now too dangerous to be used and needs to be destroyed.
Entering the Psuedo-Grail's chamber, everyone splits into teams of two to combat the Shadow Servants. Astolfo goes with Gilgamesh, while Amakusa Shirou goes with Ritsuka and Mash. After destroying the Shadow Servants, the group prepares to destroy the Psuedo-Grail. But a massive ghost with magical energy equal to a Demon God emerges from it. After the others destroy the ghost, Gilgamesh destroys the Psuedo-Grail. Afterward, Gilgamesh asks Ritsuka to judge whose the better Servant next time. He disappears in the hopes he'll meet Ritsuka again.
Christmas Event: The Second Generation is Alter
Jeanne Alter wakes him up at night and asks for an invisibility potion. Unfortunately for her, Gilgamesh accidentally gives her the Potion of Youth instead. So when she drinks, Jeanne Alter turns into a child: Jeanne Alter Lily. Gilgamesh apologizes, making the excuse that he shouldn't have opened his treasury while lying on the floor. Alter Lily criticizes him for his carelessness.
Child-Gil is weaker in ability than his older self, lacking sufficient magical energy to summon a large amount of Noble Phantasms from the Gate of Babylon. Despite that, he lacks the "Conceitful" skill possessed by his older self and displays better usage with his limited weaponry, so it could be said he is stronger as a child in that sense. Child-Gil also has the ability to petrify and stun an opponent with a move called The Kings Smile. In his peaceful state the smile looks adorable and can stun a person for a short amount of time. In his evil state, the smile can petrify a person for hours unless they have the courage to fight. The evil side being stronger, takes more of a toll on a persons body.
 Fate/Grand Order - Archer Profile [T]
Child-Gil - Archer
Illustrator and Voice actor
Illustrator: Tenkuu Sphere
Voice Actor: Aya Endō
Noble Phantasm: EX
Pretty Boy of Rosy Cheeks: C
Golden Rule: A
Magic Resistance: E
Independent Action: A
Gate of Babylon: King's Treasure
Type: Anti-Unit Noble Phantasm
The King of Heroes of Uruk. Mankind's oldest hero.
His nature is cruel and heartless. Never hearing people's opinions, a tyrant who holds only his own standards as absolute-- such disposition is not applicable to him in this form.
Fundamentally, a polite and modest boy.
Level 1 Bond
Source: Historical fact, Epic of Gilgamesh
Region: West Asia
Alignment: Chaotic Good Gender: Male
His type of woman goes along the lines of a "flower that blooms in the wild".
Level 2 Bond
It is not sure if this is something in which "he", who manifested in his usual state, became younger by eating the miracle drug of rejuvenation, or if he had manifested in the form of his younger days from the beginning.
It is believed that what is acting as the model for his mentality is the heart from when he was called a wise ruler in the past.
Level 3 Bond
- Pretty Boy of Rosy Cheeks: C
A Skill that denotes the disposition of a pretty boy that attracts people.
It works as a fascination magecraft-like effect regardless of gender, but evasion is possible by means of Magic Resistance Skill. Even without Magic Resistance, one can abate it so long there is a will to resist.
Level 4 Bond
"The Omniscient and Omnipotent Star"
Rank: EX Type: Anti-Unit Noble Phantasm
Sha Naqba Imuru.
The mentality of the King of Heroes - which spread across all corners of the world as if the brilliance of the stars, seeing through all creation - sublimated into a Noble Phantasm.
A continuously invoked-type Noble Phantasm. In regards to this work, the only Noble Phantasm he performs the release of True Name is "The Treasury of the King".
Level 5 Bond
The efficacy of the Noble Phantasm, Sha Naqba Imuru, is tremendous; not to mention the opponent's True Name and Noble Phantasm, it can even see through a heavily concealed truth with a single glance.
Although it is in a condition of being continuously invoked, one can also assume that it is being intentionally restrained.
Thus, maybe he has even attained a piece of the truth regarding the demise of human history.
Yet, he won't say a thing.
He only watches over the Master's fight and smiles.
He may spare no efforts in his assistance, but still--
子ギル - アーチャー
- Pretty Boy of Rosy Cheeks: C
- Fate/EXTRA CCC Gilgamesh Secret Garden 2
- Fate/EXTRA CCC Gilgamesh Secret Garden 3
 Fate/side material - Encyclopedia: Gilgamesh [Servant], p.059 [T]
The Archer of the previous Grail War. Mankind's oldest king of heroes, who defeated Saber. For more details, refer to his status screen in the game.
As no proper Heroic Spirit can match this man, he could be called the "Servant Killer".
Without a doubt, he is the strongest existence amongst the Servants.
Though he lost due to obsession against Saber…
Though he lost due to pride against Shirou…
Though he lost due to carelessness against XXXXX…
…the fact of the matter is that if he actually gets serious, he is a Servant that cannot be rivaled.
Perhaps because he has been living in human society for the past ten years, he seems to be hip on the latest fashions. He owns various casual clothes, but his favorite is the biker outfit he wore in the Rin route.
Well, he liked it enough to overlook Shirou's group and leave instead of letting it get dirty, at any rate. I can't believe the protagonist's life was worth less to Gil than his coat…!
It might seem strange how Gil could live in human society for ten years with a personality like his and not cause a fuss, but Gil must have realized it would have been a problem, too, because apparently he drank a certain Noble Phantasm to change his appearance and personality.
Also, during the design stage, I selfishly insisted that "Gil absolutely has to wear full golden plate armor".
Why, you ask? Well, it might be because I was repeatedly challenging a certain 60 story tower at the time…
-  - In 24th place is that guy in his childhood, the ideal king Kid Gil-kyun. Don't call him "kyun."
Blond hair and red cat eyes... which recalls a certain True Ancestor princess. Honestly, he seems like he'd get along well with Neco-Arc. (because her thought pattern is "rich people = total supremacy")
His magical energy is somewhat low in his child form, so he cannot summon large numbers of Noble Phantasms, but in exchange he wields them skillfully. In other words, he lacks the Skill: Arrogance. ...Wait, doesn't that make the child version stronger!?