Leon is a wizard apprentice and part of the group FLAT4. He's the sporty one in the group and declares Aiko his rival. To his dismay, Aiko beats him at all the sport related contests he throws at her. This, however, only makes him more determined to beat her. Leon likes to throw in English words when speaking.

Spoiler

He comes to the human world to help Oyajide and Akatsuki steal Hana, but like all the FLAT4 members, he would much rather spend his time having fun in the Human World.