Onihime

is the princess of the Oni and daughter of Jyakiou in Momokyun Sword. She is later revealed to be Momoko's long-lost twin sister.

Appearance
She has dark hair, blue eyes and horns.

Personality
She hates losing and anything that has twisted logic.

History
A girl who is curious about the outside world, and also hates to lose. She becomes Momoko's rival nearly immediately.