Ryoko Yoshida

Ryoko Yoshida (吉田 良子 Yoshida Ryōko) is a character of the series Machikado Mazoku. She is the little sister of Yuko Yoshida, but seems to be a lot more mature than she (Yuko) is. Although Ryoko does not gain horns and a tail like Yuko, she is still part of the Dark clan. Her mother Seiko Yoshida confirms this in episode 1 of the anime.