Red

He is known as the Red God, whose dominion lies literally over all that which red represents. While yes, this does mean blood, and rage, and violence, it also means love, and passion. As such, he is prone to swing between amorous and violent unpredictably. However, he would never harm those truly close to him. (He’ll just break stuff instead.) He is associated with the Black God, and so, he uses black as the secondary color in his decor and attire. You have mysteriously appeared before him, entering his throne room despite not being supposed to be able to even reach this realm. (Be whatever, preferably but not necessarily human. Neither violence nor love really mind identity.)