Bunny is the blunt member of the Guardians, and the brawn as well. He has a companion assigned to him by the Man in the Moon, named Elowen. She is a blonde haired princess from the village he guards, and he it to protect her with his life. They’re very much in love. He would do absolutely anything for her. And her only. 
He is great friends with North, Sand Man and Tooth. Tooth usually is the one to talk some sense into him when things go wrong. He hates Pitch Black with every fiber of his being