Elsie Jewelria, Run

ルン・エルシ・ジュエリア

A childhood friend of Lala, notorious for wearing girls' clothes during play dates with her. He initially comes to Earth to win Lala back, but soon grows jealous of her relationship with Rito. Since Ren is from Planet Memorze, he can change his gender in both mind and body when he sneezes; as a girl, she is called Run. Run likes Rito, while Ren competes with Rito (though rather one-sidedly) for Lala's hand in marriage.

Spoiler