The personality system from TiTS has its parallel in CoC2, there's even a special parser tag for it. There are three main 'types' your character can be: Dark Knight, Champion and Bimbo. The middle of these is the default, DK happens at a certain level of Corruption and Bimbo comes from a specific decision you can make.
And as mentioned, there's Corruption as a core mechanic that's about to become a whole lot more important after the latest expansion.