Half-Man, Half-Bull? Surely you’re joking. But if it’s Dungeon Crawling you need to do there’s nobody better than The Minotaurs.
How about a dragon how cheerfully rules over a kingdom; his people all know him for what he is, and dragons are looked upon as wise and benevolent creatures. Dragonslayers from other kingdoms coming to free it from 'tyranny' are likely to get beaten to death by peasants with cast iron skillets.