Finally made a ref sheet for Duke!
And I gave him an actual name, with alliteration! :P

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Dominik, who goes by Duke, is the mortal version of the demon inside him named Diesel. Duke was essentially created to "trap" and keep his demon in check, otherwise Diesel would wreak a lot of havoc on his own.

Duke was never really "born" - he just remembers popping into existence as a puppy and scouring the streets until he was eventually found by a grumpy reptile named Razor, who ended up raising him. He is energetic and generally outgoing, but can be flustered easily. He enjoys video games, hanging out at parties, and also sleeping a lot.

Diesel, on the other hand, is an extremely troublesome demon, so selfish and out of control that he was basically sentenced to a mortal life, trapped inside cuddly cuteness for punishment. That doesn't stop him from influencing or even completely taking control of Duke at times. He's arrogant and obnoxious, and always tries to have a say in Duke's decisions.

The mortal and demon sides butt heads a lot, but Duke still retains most of the control - only anger and intense lust can make Diesel take over for a short period of time, during which both of Duke's eyes turn red and he gets more muscular. Even though Diesel clearly came first, the two of them argue about which side is the "real" side.