I’d like to say a little of both? it depends on the circumstances of how they get together I think. like do they have a drunken hookup and are in denial about how good it was but sort of slip into going on dates under the guise of “bro hangout sessions”? tsundere cartman for sure. does kyle almost die from some convoluted south park nonsense and cartman takes out an entire crime ring to get revenge for them DARING to lay a single finger on that gorgeous red hair? yandere hands down.