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	
A 	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 	
EX 	Nero Claudius	Saber 	
A 	Caligula 	Berserker	
A 	Ozymandias 	Rider 	
A 	Cleopatra 	Assassin 	
B 	Napoleon 	Archer 	
B 	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 	
EX 	Super Orion 	Archer 	
EX 	Artoria Pendragon Alter (Swimsuit) 	Rider 	
EX 	Ashwatthama 	Archer 	
EX 	Paris 	Archer 	
EX 	Gilgamesh (Fate/EXTRA CCC) 	No Class 	
EX 	Sieg 	Caster 	
EX 	Surtr (Lostbelt) 	Saber 	
A+ 	James Moriarty 	Avenger 	
A+ 	Gray 	Assassin 	
A+ 	Calamity Jane 	Archer 	
A+ 	Gilgamesh 	Archer 	In Fate/stay night
A+ 	Euryale 	Archer 	
A+ 	Orion (Artemis) 	Archer 	
A+ 	Fujino Asagami 	Archer 	
A+ 	Florence Nightingale (Santa) 	Archer 	
A+ 	Ushiwakamaru (Swimsuit) 	Assassin 	
A 	Anne Bonny and Mary Read (Swimsuit) 	Archer 	
A 	Arjuna 	Archer 	
A 	Artoria Pendragon (Swimsuit) 	Archer 	
A 	Atalanta 	Archer 	
A 	Atalanta (Alter) 	Berserker 	
A 	Billy the Kid 	Archer 	
A 	Chiron 	Archer 	
A 	David 	Archer 	
A 	EMIYA (Alter) 	Archer 	
A 	Gilgamesh 	Archer 	In Fate/Zero
A 	Child-Gil 	Archer 	
A 	Hassan of Serenity 	Assassin 	
A 	Heracles 	Archer 	
A 	Ishtar 	Archer 	
A 	Ishtar (Swimsuit) 	Rider 	
A 	Robin Hood 	Archer 	
A 	Tomoe Gozen 	Archer 	
A 	Beni-enma 	Saber 	
A 	Astraea 	Ruler 	
A 	William Tell 	Archer 	
A 	EMIYA 	Assassin 	
A 	Shiki Ryougi 	Assassin 	
A 	Meltryllis 	Alter Ego 	
A 	Mysterious Heroine XX 	Foreigner 	
A 	Amour 	Ruler 	
B+ 	Romulus-Quirinus 	Lancer 	
B 	Astolfo 	Rider 	
B 	Nikola Tesla 	Archer 	
B 	Tawara Touta 	Archer 	
B 	Tristan 	Archer 	
B 	Erice Utsumi 	Lancer 	
B 	Illyasviel von Einzbern (Swimsuit) 	Archer 	
B 	Iskandar's Shadow 	Faker 	
B 	Oda Nobunaga 	Archer 	
B 	EMIYA 	Alter Ego 	
B 	"Old Man of the Mountain" 	Assassin 	
B 	Kingprotea 	Alter Ego 	
C 	Arash 	Archer 	
C 	Chloe von Einzbern 	Archer 	
C 	Helena Blavatsky (Swimsuit) 	Archer 	
C 	Napoleon 	Archer 	
C 	Passionlip 	Alter Ego 	
C 	Oda Nobukatsu 	Archer 	
C 	Saitou Hajime 	Saber 	
C 	Alcides 	Archer / Avenger	
C 	Medusa 	Rider 	
C 	No Name 	Archer 	
E- 	Soldiers of Ionioi Hetairoi 	 	
E- 	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 	
A 	Merlin (Prototype) 	Caster 	
A 	Goetia 	Beast 	
B 	Tiamat 	Beast 	
B 	Heaven's Hole 	Beast 	
C 	Shiki Ryougi 	Saber 	
C 	Kama 	Assassin 	
C 	Kama/Mara 	Beast 	
C 	Light Koyanskaya 	Assassin 	
D 	Larva Tiamat 	Alter Ego 	
E 	Kiara Sessyoin 	Alter Ego 	
E 	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	
EX 	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	
EX 	Mecha Eli-chan MkII	Alter Ego	
==Innocent Monster==
Rank	User 	Class 	Notes
EX 	Elizabeth Báthory (Halloween)	Caster 	
EX 	Antonio Salieri 	Avenger 	
A 	Elizabeth Báthory 	Berserker	
A 	Vlad III (EXTRA) 	Lancer 	
B 	Mephistopheles 	Caster 	
D 	Hans Christian Andersen 	Caster 	
D 	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==
 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 	
A 	Arthur Pendragon 	Saber 	
B 	Mordred 	Saber 	
B 	Artoria Pendragon (Alter) 	Saber 	
B 	Artoria Pendragon (Lily) 	Saber 	
B 	Beowulf 	Berserker	
C+ 	Mysterious Heroine X 	Assassin 	
C 	Georgios 	Rider 	
C 	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 	
EX 	Asclepius 	Caster 	
EX (D)	Thomas Edison 	Caster 	
A+ 	Archimedes 	Caster 	
A+ 	Merlin (Prototype) 	Caster 	
A 	BB 	MoonCancer	
A 	Irisviel (Dress of Heaven) 	Caster 	
A 	Medea 	Caster 	
A 	Elizabeth Báthory (Halloween)	Caster 	
A 	Leonardo da Vinci 	Caster 	
A 	Scáthach-Skadi 	Caster 	
A 	Circe 	Caster 	
A 	Amour 	Ruler 	
A 	Leonardo da Vinci (Child) 	Rider 	In Fate/Grand Order Arcade
B+ 	Avicebron 	Caster 	
B+ 	Nitocris 	Caster 	
B 	François Prelati 	Caster 	
B 	Mecha Eli-chan 	Alter Ego 	
B 	Mecha Eli-chan MkII 	Alter Ego 	
B 	Chen Gong 	Caster 	
B 	Mephistopheles 	Caster 	
B 	Zhuge Liang 	Caster 	
B 	Medea (Lily) 	Caster 	
B 	Helena Blavatsky 	Caster 	
B 	Sitonai 	Alter Ego 	
C 	Semiramis 	Assassin 	
C 	Hans Christian Andersen 	Caster 	
C 	Geronimo 	Caster 	
C 	Solomon 	Caster 	
C 	Goetia 	Beast 	
C 	Merlin 	Caster 	
C 	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	
A 	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	
*