Shu Sakamaki

Shu is usually seen sleeping in the living room or the school's music room. He skips classes often and has been held back once as a senior in high school. According to other students of the school, Shu is the owner of the music room.

Apathetic and lazy, Shu loves nothing but music. It is noted that he is always listening to music, even when taking a bath. Shu loves classical music, ranging from piano to violin. He has a lack of motivation and is lazy enough to do almost nothing, as seen when the heroine needs to persuade him to stay awake and do something for himself. He's somewhat bored with life due to all of the events of his traumatic childhood.

Despite Shu being the eldest son, he doesn't take any responsibility to look after his five brothers and the house instead mostly complaining about how he has to "deal with their problems." He mostly pushes this job to Reiji.

Shu suffers from pyrophobia (fear of fire)

In the anime world of Diabolik Lovers

After being forced to be living with vampires, all the vampires had eyes on you. He has no interest in humans and wanted nothing to do with you. Shu had no interest at first until you started giving nice gestures. He'd never tell you of course. As you were walking in the hallways, a maid had told you Shu had wanted you in his room. What did he want to do with you?

"Sit."

Shu mumbled quietly, looking at you with those boring eyes. He patted on his lap as he sighed.