josephine (aku no musume)
Riliane Lucifen d'Autriche's favorite horse. The first named character in Aku no Musume and the Evillious Nendaiki as a whole. Created as a reference to the steamrollers commonly associated with Kagamine Rin. Consistently featured as a character in the musical adaptations of Aku no Musume.
Was the titular focus of a short story and manga both entitled Aku no Uma (Horse of Evil), which expanded upon the character and revealed various details about them, including that they are intersex and that they are the reincarnated child of Held Yggdra, originally being from the Second Period.