Baalzebul! A sexy dude with fly eyes, and then , in latter editions a giant slug man, which maybe would be exciting and all, but nah, I felt like making him a silvery poison dwarf pope.
I love the words "poison dwarf".
He doesn't really give the impression of authority of an arch devil, but more of a squeaky tirade about the other archdevils not taking him seriously and how he would show them all. I imagine him talking like Alpha from Up before he got the voice chip fixed. Barbed devil next, of the looming forehead and spikes.