Fictionkin:

Literally Me:
Erik/The Phantom (musical)
Marinette (Miraculous Ladybug)
The Girl (The True Lives of the Fabulous Killjoys Comics)

Other IDs:
Mary (ib)
Sachiko (corpse party)
Peridot (steven universe)
Teto (UTAU)

Secondary:
Galko (Please tell me! galko-chan)
Erik/The Phantom (1990's miniseries)
Gumi (Vocaloid)
Terezi (homestuck)
WD's Pearl (currently uncannon, Steven Universe)
Mercy (overwatch)
Samune Zimi (Vocaloid Reboot video)

Tertiary:
Marie (splatoon)
Green Inkling (splatoon)

General Otherkin:
Felinekin (Abyssinian and Turkish Angora)
Deerkin (white doe)
Angelkin (haniel)
Vampirekin