Anime Games that allow you to create your own anime characters (avatar) online:
Sword Art Online: Fatal Bullet
Onigiri
Phantasy Star Online 2
Code Vein
Kurtzpel
Closers
Soul Worker
Genshin Impact
Among them, following games are the most popular games according to best anime games database:
Sword Art Online: Fatal Bullet
Genshin Impact
Anime Games that allow you to modify existing characters, but do not allow you to create your own character (avatar):
Kandagawa Jet Girls
Senran Kagura: Peach Beach Splash
Fate/Extella Link (very limited at just some costume level)
Black Clover: Quartet Knights (very limited at just some costume level)
Sword Art Online: Fatal Bullet
Onigiri
Phantasy Star Online 2
Code Vein
Kurtzpel
Closers
Soul Worker
Genshin Impact
Among them, following games are the most popular games according to best anime games database:
Sword Art Online: Fatal Bullet
Genshin Impact
Anime Games that allow you to modify existing characters, but do not allow you to create your own character (avatar):
Kandagawa Jet Girls
Senran Kagura: Peach Beach Splash
Fate/Extella Link (very limited at just some costume level)
Black Clover: Quartet Knights (very limited at just some costume level)
Jotaku, Anime Game Gamer
I. Eternal Return NA Immortal Tier
II. Super Mecha Champions NA Legendary Tier
III. Tokyo Ghoul: re Call to Exist NA Top #2
IV. Fate/EXTELLA Link: NA Top #9
V. Senran Kagura PEACH BEACH SPLASH: NA Top #3
I. Eternal Return NA Immortal Tier
II. Super Mecha Champions NA Legendary Tier
III. Tokyo Ghoul: re Call to Exist NA Top #2
IV. Fate/EXTELLA Link: NA Top #9
V. Senran Kagura PEACH BEACH SPLASH: NA Top #3