Skill/I

I Will Not Go Home Yet!

Rank	User	Class	Notes
B++	Ibaraki-douji (Swimsuit)	Lancer

If I Change into a Swimsuit

Rank	User	Class	Notes
A+	Medb (Swimsuit)	Saber

Illusion

Rank	User	Class	Notes
A	Rider (Learn with Manga! FGO)	Rider

Illusion Arts

Rank	User	Class	Notes
A	Merlin	Caster
	François Prelati	Caster

Illusionist (Fake)

Rank	User	Class	Notes
C+	Charlotte Corday (Swimsuit)	Caster

Imaginary Around

Rank	User	Class	Notes
EX	Parvati	Lancer

Imaginary Number Arts

Rank	User	Class	Notes
B+	Van Gogh	Foreigner

Immortal Sage

Rank	User	Class	Notes
A	Saber (Learn with Manga! FGO)	Saber

Imperial Privilege

Rank	User	Class	Notes
EX	Romulus	Lancer
	Nero Claudius	Saber
A	Caligula	Berserker
	Ozymandias	Rider
	Cleopatra	Assassin
B	Napoleon	Archer
	Wu Zetian	Assassin

Imposing Stance

Rank	User	Class	Notes
B	Musashibou Benkei	Lancer

Impotent Rage

Rank	User	Class	Notes
B+	Mephistopheles	Caster	Upgrade from Innocent Monster (Fate/Grand Order)

In Sonorous Praise of Love

Rank	User	Class	Notes
A	Tristan	Archer	Upgrade from Harp of Healing (Fate/Grand Order)

Incarnated Spirit

Rank	User	Class	Notes
A	Consort Yu	Assassin

Incarnated Spirit of Summer

Rank	User	Class	Notes
A+	Consort Yu (Swimsuit)	Lancer

Incarnation of Rage

Rank	User	Class	Notes
EX	Ashwatthama	Archer

Incitement

Rank	User	Class	Notes
EX	Gaius Julius Caesar	Saber

Independent Action

Rank	User	Class	Notes
EX	Meltryllis (Swimsuit)	Lancer
	Super Orion	Archer
	Artoria Pendragon Alter (Swimsuit)	Rider
	Ashwatthama	Archer
	Paris	Archer
	Gilgamesh (Fate/EXTRA CCC)	No Class
	Sieg	Caster
	Surtr (Lostbelt)	Saber
A+	James Moriarty	Avenger
	Gray	Assassin
	Calamity Jane	Archer
	Gilgamesh	Archer	In Fate/stay night
	Euryale	Archer
	Orion (Artemis)	Archer
	Fujino Asagami	Archer
	Florence Nightingale (Santa)	Archer
	Ushiwakamaru (Swimsuit)	Assassin
A	Anne Bonny and Mary Read (Swimsuit)	Archer
	Arjuna	Archer
	Artoria Pendragon (Swimsuit)	Archer
	Atalanta	Archer
	Atalanta (Alter)	Berserker
	Billy the Kid	Archer
	Chiron	Archer
	David	Archer
	EMIYA (Alter)	Archer
	Gilgamesh	Archer	In Fate/Zero
	Child-Gil	Archer
	Hassan of Serenity	Assassin
	Heracles	Archer
	Ishtar	Archer
	Ishtar (Swimsuit)	Rider
	Robin Hood	Archer
	Tomoe Gozen	Archer
	Beni-enma	Saber
	Astraea	Ruler
	William Tell	Archer
	EMIYA	Assassin
	Shiki Ryougi	Assassin
	Meltryllis	Alter Ego
	Mysterious Heroine XX	Foreigner
	Amour	Ruler
B+	Romulus-Quirinus	Lancer
B	Astolfo	Rider
	Nikola Tesla	Archer
	Tawara Touta	Archer
	Tristan	Archer
	Erice Utsumi	Lancer
	Illyasviel von Einzbern (Swimsuit)	Archer
	Iskandar's Shadow	Faker
	Oda Nobunaga	Archer
	EMIYA	Alter Ego
	"Old Man of the Mountain"	Assassin
	Kingprotea	Alter Ego
C	Arash	Archer
	Chloe von Einzbern	Archer
	Helena Blavatsky (Swimsuit)	Archer
	Napoleon	Archer
	Passionlip	Alter Ego
	Oda Nobukatsu	Archer
	Saitou Hajime	Saber
	Alcides	Archer / Avenger
	Medusa	Rider
	No Name	Archer
E-	Soldiers of Ionioi Hetairoi
	Shinsengumi Troops of the Flag of Sincerity

Independent Action (Celeb)

Rank	User	Class	Notes
EX	Jeanne d'Arc (Swimsuit)	Archer

Independent Action (Self-Centered)

Rank	User	Class	Notes
A	Sei Shounagon	Archer

Independent Action with Viy

Rank	User	Class	Notes
EX	Anastasia and Viy (Swimsuit)	Archer

Independent Manifestation

Rank	User	Class	Notes
A	Merlin	Caster
	Merlin (Prototype)	Caster
	Goetia	Beast
B	Tiamat	Beast
	Heaven's Hole	Beast
C	Shiki Ryougi	Saber
	Kama	Assassin
	Kama/Mara	Beast
	Light Koyanskaya	Assassin
D	Larva Tiamat	Alter Ego
E	Kiara Sessyoin	Alter Ego
	Kiara Sessyoin (Swimsuit)	MoonCancer

Independent Navigation

Rank	User	Class	Notes
A	Voyager	Foreigner

Indomitable

Rank	User	Class	Notes
A	Heracles	Berserker	Upgrade from Battle Continuation (Fate/Grand Order)
B+	Nemo	Rider

Inexhaustible Bale

Tawara Touta's Inexhaustible Bale Noble Phantasm is treated as a Skill in Fate/Grand Order.

Infantile Regression

Rank	User	Class	Notes
C	Kingprotea	Alter Ego

Infinite Mana Supply

Rank	User	Class	Notes
B	Miyu Edelfelt	Caster
C	Illyasviel von Einzbern	Caster

Infinite Regress Lyric

Rank	User	Class	Notes
C	Mysterious Idol X (Alter)	Foreigner

Information Erasure

Rank	User	Class	Notes
B	Jack the Ripper	Assassin

Inherent Insight

Rank	User	Class	Notes
A++	Sherlock Holmes	Ruler

Inherent Wisdom

Rank	User	Class	Notes
EX	Leonardo da Vinci	Caster
	Nikola Tesla	Archer	Upgraded Rank (Fate/Grand Order)
A	Nikola Tesla	Archer

Inn Creation

Rank	User	Class	Notes
B	Beni-enma	Saber

Innocent Kaiju

Rank	User	Class	Notes
EX	Mecha Eli-chan	Alter Ego
	Mecha Eli-chan MkII	Alter Ego

Innocent Monster

Rank	User	Class	Notes
EX	Elizabeth Báthory (Halloween)	Caster
	Antonio Salieri	Avenger
A	Elizabeth Báthory	Berserker
	Vlad III (EXTRA)	Lancer
B	Mephistopheles	Caster
D	Hans Christian Andersen	Caster
	Phantom of the Opera	Assassin
E	Alexandre Dumas	Caster

Innocent Monster (Flame)

Rank	User	Class	Notes
C	Chacha	Berserker

Innocent Monster (Foreign)

Rank	User	Class	Notes
A	Ivan the Terrible (Lostbelt)	Rider

Innocent World

Rank	User	Class	Notes
EX	Pale Rider	Rider

Innovation

Innovation (革新, Kakushin^?) is a special Skill granted to heroes who brought about revolutions in their eras. Oda Nobunaga possesses the version Unifying the Nation by Force - Innovation due to the special characteristics of her own revolution.

Innovator Bunny

Rank	User	Class	Notes
A	Light Koyanskaya	Assassin

Insanity

Rank	User	Class	Notes
B+	Abigail Williams (Swimsuit)	Foreigner
B	Abigail Williams	Foreigner
C	Van Gogh	Foreigner

Insect Eater

Rank	User	Class	Notes
EX	Kazuradrop	Alter Ego

The Instant Before the Strike

Rank	User	Class	Notes
C	Mandricardo	Rider

Instant Shadowless Sword

Rank	User	Class	Notes
C+	Mysterious Heroine X (Alter)	Berserker	Upgrade from Instinct (Fate/Grand Order)

Instinct

Rank	User	Class	Notes
A	Artoria Pendragon	Saber
	Arthur Pendragon	Saber
B	Mordred	Saber
	Artoria Pendragon (Alter)	Saber
	Artoria Pendragon (Lily)	Saber
	Beowulf	Berserker
C+	Mysterious Heroine X	Assassin
C	Georgios	Rider
	Mysterious Heroine X (Alter)	Berserker

Intersect of Yin-Yang

Rank	User	Class	Notes
B	Li Shuwen (Old)	Assassin

Intoxicating Aroma of Fruits

Rank	User	Class	Notes
A	Shuten-douji	Assassin

Invictus Spiritus

Rank	User	Class	Notes
A	Nero Claudius	Saber

Invincible Sword

Rank	User	Class	Notes
A	Saitou Hajime	Saber

It Can't Be Helped

Rank	User	Class	Notes
A-	Oda Nobunaga	Avenger

Item Construction

Rank	User	Class	Notes
EX	Paracelsus von Hohenheim	Caster
	Asclepius	Caster
EX (D)	Thomas Edison	Caster
A+	Archimedes	Caster
	Merlin (Prototype)	Caster
A	BB	MoonCancer
	Irisviel (Dress of Heaven)	Caster
	Medea	Caster
	Elizabeth Báthory (Halloween)	Caster
	Leonardo da Vinci	Caster
	Scáthach-Skadi	Caster
	Circe	Caster
	Amour	Ruler
	Leonardo da Vinci (Child)	Rider	In Fate/Grand Order Arcade
B+	Avicebron	Caster
	Nitocris	Caster
B	François Prelati	Caster
	Mecha Eli-chan	Alter Ego
	Mecha Eli-chan MkII	Alter Ego
	Chen Gong	Caster
	Mephistopheles	Caster
	Zhuge Liang	Caster
	Medea (Lily)	Caster
	Helena Blavatsky	Caster
	Sitonai	Alter Ego
C	Semiramis	Assassin
	Hans Christian Andersen	Caster
	Geronimo	Caster
	Solomon	Caster
	Goetia	Beast
	Merlin	Caster
	Murasaki Shikibu	Caster
D	Marie Antoinette (Swimsuit)	Caster
—	Gilles de Rais	Caster
	William Shakespeare	Caster
	Xuanzang Sanzang	Caster
	BB (Swimsuit)	MoonCancer

Item Construction (Fake)

Rank	User	Class	Notes
A	Charles Babbage	Caster
	Gilgamesh	Caster

Item Construction (Mechanical)

Rank	User	Class	Notes
C	Izumo-no-Okuni	Caster

Item Construction (Revision)

Rank	User	Class	Notes
EX (A+~E)	Alexandre Dumas	Caster

Item Construction (Robes)

Rank	User	Class	Notes
A	Miss Crane	Caster

Item Construction (Strange)

Rank	User	Class	Notes
EX	Nero Claudius (Swimsuit)	Caster