Kanna Kamui

Tohru's friend from the dragon realm who got exiled from her world and winds up living with Kobayashi as well. She is very young by dragon standards and starts attending 3rd Grade in Japan in her humanized form. She initially assumes that Kobayashi seduced Tohru into staying and wanted her to return to their original world. She later grows attached to Kobayashi, viewing her as a mother figure.

(Source: Wikipedia)