Asriel Dreemurr (typically /ˈæzriəl ˈdriːmər/) is the biological child of Toriel and Asgore and the adoptive brother of the first human. He serves as the final boss of the True Pacifist Route.
Just like Toriel and Asgore, his an anthropomorphic goat monster. Asriel wears a Blue-yellow striped sweater with a large star on it. He also wears blue pants. He somewhat don't have Horns like his family.
Chara is Asriel's adoptive sibling. He was devestated when Chara died.