this is a female bill x dipper bill sent his only daighter to live with the twins dip and mab and one day while going to school mabel got sick so the turned around and brought her back but they ended getting in a car crash after they had let mabel inside there house dipper protected bella but a peice of broken glass to his chest its a miracle he is alive there parents our dead and so now they live with there grunkles just so you know bill actually wont cause mayhem cause that is always so anoying i mean come on he is easily like the best character