Thrash is the son of Sonic Sr. and Amy Rose. He is the eldest half brother of Jill and Sonic Jr. (Or so I think). He is a Child of the Sacred Inferno, he maybe a danger to all of the Multiverse if his parents are slain. He made love to Tenel Tah years after the war with the Dark Lords. After many years he finds out he is a father of a humanhog.