Tickle Komori

A mischievous fairy who was imprisoned in a book for playing tricks before being freed by Tiko (although she claims to be a magical princess on the run from a dragon). She decides to stay around for a while, and uses her magic to manipulate everyone's memories, making them believe she has always been Tiko's twin sister. Although she loves playing tricks, she doesn't hesitate to use her magic to solve problems. But being part of a family is a new experience for Tickle, and magic can't solve problems she doesn't understand. She is voiced by Rihoko Yoshida. Tickle was renamed Lilli in the Italian dub.

(Source: Wikipedia)