I am suggesting the ability to get tattoos.
It wouldn't change the appearance of your character but rather give your character some extra description info.
Now lets say we put a new NPC in saaay... Gecko, a ghoul that can give people tattoos. (Including CH1 characters because a ghoul can't exactly reject you because you're ugly.)
So he would charge say, 500 caps for a tattoo and you get to choose what you want it to say. (Maybe a maximum of 10 characters so people can't have fdsdezdfgsfdfesghdbrfbnftgbhgrdfgbdrgae tattoos.)
Now you will have a little extra info in your character description, here's an example.
You see Christine, she looks unhurt. She has a Big Momma tattoo.
I'd guess Tattoo removal should cost a high amount of caps due to it being a delicate procedure that takes time and effort, like 5k maybe?
What do you guys think?