What is a "red flag" in a person that you actually find attractive?

We always talk about toxic traits to avoid, but be honest: do you have a toxic trait guilty pleasure?

For example, I know I shouldn't, but I find it strangely attractive when someone is a little bit obsessed with their work/passion, even to the point of being slightly unavailable. It shows drive, even if it’s annoying.

Does anyone else have a "bad" trait they secretly like? Or am I just broken?