Asmodaus

Asmodeous is one of the three dogs guarding the palace of the demon king. Together with Arcana and Arachne, they are to believed to be called Cerberus together. 

The demon king Aseroth Hades Jachquin  Long Echlarerin Trio Gabrieleus Aluminatium Verona is a half demon half Angel who leans towards his angelic nature rather than the brutish violent nature of his siblings. He is known as Jach Echlare, and although a very busy French/ German trader in the mortal realm, a king of demons in Hell, and the ruler of purgatory, he still finds time to play with his beloved pets.