He is the oldest of the Maaka children, has no qualms about sucking blood, and believes vampires to be superior to humans. He can't stand men and refuses to drink blood from them. He especially hates stressed  He only wants to drink women's blood and his favorite method for getting his human preys is by seducing them.
He goes out on many dates and doesn't go back home.
Ren sees the act of biting as a metaphor for sexual intercourse, and often commits both acts simultaneously.
he only flirt women