Sakamaki Subaru

Subaru Sakamaki (逆巻 スバル Sakamaki Subaru) is the sixth and youngest son of the Sakamaki household. Subaru is the only son of Christa, third wife of Karlheinz, the Vampire King.
Subaru can be described as the loner type. He is usually alone and never cares about what's happening around him. Subaru is the silent type who usually sleeps in a coffin, which is also inside his room. However, he easily gets angry and resorts to violence, going as far as to break everything when he gets extremely angered.

He manages to compress this side when around Yui, but is still prone to outbursts. There is a tsundere side of him that only Yui can see. He's a delinquent type, kind of violent and loves to damage things. He's also a sadist, but despite all, can occasionally be sweet. Subaru can sometimes be considerate as he tried to help Yui escape from the mansion and let her have his silver knife that could kill vampires likes him.