Horohoro's little sister who trains Horohoro in the Shaman King franchise.
She is Horohoro's sister who shares the same dream as Horohoro to create a vast field of Butterbur. Even though her past has not been reveal yet, she knows Horohoro's tragic past which she tells Opacho outside of the tournament in Tokyo during Horohoro's match with the Team Wisdom King.
Pirika Usui, who is created by Hiroyuki Takei, has no information regarding any inspiration used to create her. She first appears in Shaman King volume 5 and episode 14. Her Japanese voice actress is Tomoko Kawakami, and her English voice actress is Rachel Lillis.
Hungary - IIona Molnár
Brazil - Tatiane Keplemaier
NOTE: The information below is manga only info. See anime differences under "anime and manga differences" paragraph.
She has no powers because she has no spirit. Yet, she is a shaman because she can see spirits.