Fuyumi Yanderune is fanloid and the younger sister of Fuyumi Toki.
Fuyumi wears a black and purple kimono just like her "older brother", Toki. She has brown eyes, pale skin, and black hair in a long bob hair cut. Her character item is a samurai sword and a plum. Her kimono is only down to her knees, which consequently reveals her Vocaloid stockings.
Fuyumi is yandere, which means she is extremly unstable. She is in love with Kamui Gakupo and is very jealous of Megurine Luka. When not unstable, she is a sweet loving girl but becomes violent when someone (Luka) touches Gakupo. She is friends with Kitsune Nijiro, the person who typically is the one who pulls Fuyumi away from her victims. She is over obsesessive about Gakupo and will kill anyone who comes between her and "her" Gakupo.
Fuyumi was desighned to take a jab at Tei Sukone fans, thus her name (Yanderune mentally ill sound), which is a pun considering Sukone means "Healthy sound".