Ishizu

Ishizu is the son of the current demon king. He seeks to find a human and become demon king himself. He is very self-centered it seems, and wants to overpower his father. In fact, he hates his father and refuses to be known as the prince of the demon realm. Though not as much as Kuro, he seems to also be a bit naive. Upon first meeting Pochi, it took him a while to figure out she was a human... Which then caused a lot of trouble.