His name is Bills and he's not a rabbit he's a cat its design is based on Sphinx cats, and a mix of the ancient egyptian gods Anubis and Sekhmet
also I read that he's going to be the most powerful character in Z history PERIOD, way above frieza, cell, majin buu, broly combined etc. and the reason why he was asleep was that he's the god of destruction and has to eliminate planets and even galaxies for there to be balance in the universe, so when freiza was running around destroying shyt there was no need for him to take charge and decided to rest a couple decades... but theres a prohecy of another god (goku) rising up to challenge him, supposedly the kais fear him more than anything 2
here he stops a full powered ssj 3 goku charge with one finger and fights android 18, vegeta, gohan, and fat buu all at the same time without breaking a sweat
one of his main attacks its like a double death ball that he can combine into one