You must be good friends. [It's the "I'm going to turn your hated first name into a nickname to make it even worse!" element that proves it. He's reminded of Gojyo and Goku.

The cut is almost wholly healed now, although the line of fresh skin over what had been a cut is still pink and fragile. Hakkai lifts his hands away.] Don't scratch that until it's had a chance to heal properly. -- I'm a god now. Before that, I was a youkai. Like my shinki there.

[He inclines his head in Asshole's direction, and points out the small metal cuffs adorning his left ear.] These are limiters; they help me look human. Youkai not being very common in this world.