Yukari Sendo is the smartest student at Yokai Academy, and the youngest at age 11 (later 12). She is a witch who dons a typical witch costume (consisting of a hat and cape).As a witch, she has problems with her classmates discriminating against her . Despite ranking #1 on the examinations, she was a lonely prankster before meeting Tsukune and Moka. She initially hated Tsukune, claiming that she has fallen in love with Moka, and uses her magical powers to try to drive them apart. However, after both Tsukune and Moka save her from bullying classmates, she falls for him too, and her obsession with both has driven her to try to create a three-way relationship between them. Despite her genius IQ, Yukari is very childish in nature, and is often indecisive on whether or not she either loves Tsukune or Moka more than the other.
Source from Wikipeida