Belphegor, aka "the Lord of the Gap" is a Demon who apparently...*sigh* tempts men's souls with invention and scientific discovery as a spirit of Sloth...
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Anyways, the picture on wiki has him as a wheelchair bound devil, and I was listening to a CoF song "Thirteen Autumns and a Widow" and so I thought "What about a kid genius demon in a wheelchair?" So voila!
Peor is seemingly one of the weaker Devil Princes, due to his diminutive body and inability to travel on his own, but he doesn't let the presumptions bother him. He is kind to his minions, helpful to those he is around, and enjoys using Bright Age technology in his invention process to develop all kinds of gadgets and gizmos. Because of his supportive demeanor and brilliance, the other Devil Princes rather like having him around. It does help also that he is related to a quarter of their number AND the Radiant Tetrarch of the Dragontribe (Lucifer)!