Sakura, Genki

ゲンキ

A 10-year-old elementary school boy who acts as the group's 'leader'. He has a good heart and genuinely cares for his friends and the monsters. His goal is to turn all the evil monsters back into good ones. Determined, optimistic, and hopeful, Genki is a real go-getter. Genki also directly fights enemy monsters by wearing his roller blades in combat.
He is also surprisingly strong for a 10-year-old (he has shown the ability to lift objects several times his own weight from time to time in the series), although it is not known whether this is due to his own innate strength or because he is in the game world (and thus subject to some game mechanic).