What kind of markers are good for drawing on skin?

I’ve got a pair line work tattoos that I’m not sure if I want to get developed more or not. I’d like to noodle around with them myself with markers or pens but I’m not sure what will draw well on skin. Sharpie ink tends to rub off on everything and I’d like to play around with more colorful pens or markers as well.

Am I over thinking this? Would old school crayolas get the job done?