"... he found me in a moment of weakness. Most of my hometown had been set upon by goblin raiders while I was out in the fields ... by the time I got back to try to help, many of my friends and family were already dead. I was surrounded, pinned to a wall, a knife at my throat ... and everything froze. A voice echoed in my mind: 'Too late to save them ... but with my power you can avenge them.' I was terrified, enraged, desperate ... probably just what it wanted. I asked what the price would be. 'Your body' was the answer."

"You thought it meant sex, didn't you."

"I thought it meant the occasional possession!"

Inspired by ven_blackfurr's Alistair, here's Wolfgang as a D&D style warlock. Takashi, as his patron, makes Wolfgang carry him around so he can observe the material plane directly - hence the exposed belly, the sigil on it acting as Takashi's viewport.