Ten-ou is the son of Taishaku-ten and Shashi's. Ashura is his twin brother, but since they were separated at birth they never seen each other. He's a really nice guy, unlike his tyrant father and cruel mother. He fell in love with Kendappa-ou, because she was the first person who seen him for who he is and not his title.
(source: Nishi's RG Veda Gallery)