Beelzebub being a Hellhound actually makes sense once you realize in the Divine Comedy, gluttony was guarded by history's most famous Hellhound, Cerberus #HelluvaBoss
I like how MH has all these nutty designs, but are usually based around them being four legged vertebrates And then you get elder dragons like Fatalis, who's basically "what if we had a normal dragon and pumped it with nightmare fuel"