EVERYTHING IS A CANON!!!
Anime
They say all of these are just a spin-offs that aren't important to the plot. But for us Nasuverse fans, all of these are canon
Nasuverse sorted by timeline : https://myanimelist.net/stacks/58240
Nasuverse sorted by timeline : https://myanimelist.net/stacks/58240
Fate/stay night Movie: Unlimited Blade Works
Fate/stay night: Unlimited Blade Works

Movie, 2010,
1 ep
Me:-
Author:9

Movie, 2013,
2 eps
Me:-
Author:8
*note: this is a lost media, there is no way you can watch this now.
Fate/Grand Order: Zettai Majuu Sensen Babylonia - Initium Iter
Fate/Grand Order: Absolute Demonic Front - Babylonia Initium Iter

Special, 2019,
1 ep
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya: Undoukai de Dance!
Fate/Kaleid Liner Prisma Illya: Dance at the Sports Festival!

OVA, 2014,
1 ep
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya 2wei! Specials
Fate/Kaleid Liner Prisma Illya 2Wei! Shorts

Special, 2014,
5 eps
Me:-
Author:9
Manga de Wakaru! Fate/Grand Order
Learning with Manga! Fate/Grand Order

TV Special, 2018,
1 ep
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya 2wei Herz! Specials
Fate/Kaleid Liner Prisma Illya 2Wei Herz! Shorts

Special, 2015,
5 eps
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya 2wei!: Mahou Shoujo in Onsen Ryokou
Fate/kaleid liner Prisma Illya 2Wei!: Magical Girl in Hot Springs Inn

OVA, 2015,
1 ep
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya 3rei!! Specials
Fate/Kaleid Liner Prisma Illya 3rei!! Shorts

Special, 2016,
6 eps
Me:-
Author:9
Fate/Zero: Onegai! Einzbern Soudanshitsu
Fate/Zero: Please! Einzbern Counseling Room

Special, 2012,
6 eps
Me:-
Author:9
Fate/Grand Order: Himuro no Tenchi - 7-nin no Saikyou Ijin-hen
Fate/Grand Order x Himuro's World: Seven Most Powerful Great Figures Chapter

TV Special, 2017,
1 ep
Me:-
Author:9
Fate/kaleid liner Prisma☆Illya Movie: Sekka no Chikai - Kuro Sakura no Heya
Fate/Kaleid Liner Prisma Illya: Vow in the Snow - Dark Sakura's Room

Special, 2018,
1 ep
Me:-
Author:8
Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai
Fate/Grand Order: You've Lost Ritsuka Fujimaru

ONA, 2023,
33 eps
Me:-
Author:7
Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai Season 2
Fate/Grand Order: You've Lost Ritsuka Fujimaru Season 2

ONA, 2024,
26 eps
Me:-
Author:7
Fate/kaleid liner Prisma☆Illya Movie: Licht - Namae no Nai Shoujo Mini Anime
Fate/kaleid liner Prisma Illya: Licht Nameless Girl Mini Anime

ONA, 2021,
3 eps
Me:-
Author:7
Ken to Mahou no Logres: Inishie no Megami x Fate/Extella
Logres of Swords and Sorcery: Goddess of Ancient x Fate/Extella

CM, 2016,
1 ep
Me:-
Author:6
Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai - Nenmatsu Special
Fate/Grand Order: You've Lost Ritsuka Fujimaru - Year-End Special

TV Special, 2022,
1 ep
Me:-
Author:7
Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai - Dai Bounen Otanoshimikai 2023
Fate/Grand Order: You've Lost Ritsuka Fujimaru

TV Special, 2023,
7 eps
Me:-
Author:8
Kara no Kyoukai Movie: Mirai Fukuin - Manner Movie
The Garden of Sinners: Future Gospel - Manner Movie

Movie, 2013,
1 ep
Me:-
Author:9
Canaan: Minorikawa Report 201X Shanghai
Canaan: Minorikawa Report Year 201X Shanghai

Special, 2010,
1 ep
Me:-
Author:-
Fate/kaleid liner Prisma☆Illya Specials
Fate/Kaleid Liner Prisma Illya Shorts

Special, 2013,
5 eps
Me:-
Author:9
Fate/stay night: Unlimited Blade Works Prologue
Fate/stay night [Unlimited Blade Works] - Prologue

TV Special, 2014,
1 ep
Me:-
Author:9
Fate/stay night: Unlimited Blade Works 2nd Season - Sunny Day
Fate/stay night [Unlimited Blade Works] Season 2: Sunny Day

Special, 2015,
1 ep
Me:-
Author:9
Lord El-Melloi II-sei no Jikenbo: Rail Zeppelin Grace Note Special
Lord El-Melloi II's Case Files: Rail Zeppelin Grace Note - Waver, Reunion, and the Magic Lantern

TV Special, 2021,
1 ep
Me:-
Author:8
Lord El-Melloi II-sei no Jikenbo: Rail Zeppelin Grace Note - Hakamori to Neko to Majutsushi
Lord El-Melloi II's Case Files: Rail Zeppelin Grace Note - A Grave Keeper, a Cat, and a Mage

TV Special, 2018,
1 ep
Me:-
Author:8
Fate/kaleid liner Prisma☆Illya: Prisma☆Phantasm
Fate/Kaleid Liner Prisma Illya: Prisma★Phantasm

Movie, 2019,
1 ep
Me:-
Author:8
Fate/Grand Order: Zettai Majuu Sensen Babylonia Recaps
Fate/Grand Order: Absolute Demonic Front - Babylonia Recaps

TV Special, 2019,
3 eps
Me:-
Author:7