Sakamaki Laito

Laito is the third son of the Sakamaki household and a second-year high school student. Laito, along with Kanato and Ayato, the triplets, are the sons of Cordelia, daughter of the Demon Lord and the first wife of Karlheinz, the Vampire King.

Laito is extremely perverted, to the point where his personality has gotten him suspended from his school many times. Laito is both a Do-Masochist (extreme masochist) and a Do-Sadist (extreme sadist). He is always cheerful and loves to joke and is similar to Ayato when teasing Yui, whom he calls "Bitch-chan". However, his personality suddenly changes when something goes against his wishes, usually when Yui is too defiant around him. He doesn't like when Yui disobeys his orders and he often punishes her because of that. Laito has also been shown to be good at interpreting others' motives.