Leosaya

Canon
This ship isn't canon. Leon killed Maizono when Maizono was luring Leon to kill him. However they are shipped for a few other reasons. Mizano was a singer, and Leon was trying to be a singer.They wound probably be a star couple.

Speculation and Assumption
When leon went into Maizono's room he went in to calm her down, and accidentally killed her. Leon was reviled in the manga to have a crush on Maizono.