I did some thinking while I was in the shower:
I think that every Hogwarts House has a corresponding evil archetype.
- Slytherin is, pretty obviously, the power-hungry dictator.
- Gryffindor would be the tyrannical leader convinced that he’s working to better humanity.
- Hufflepuff is either the loyal goon who never questions orders, or the leader devoted to a religion/philosophy and follows it without questioning it.
- Ravenclaw is the Evil Genius, duh.