I think that piercing and tattoos are a form of personal expression. If someone decides they want them that is their decision that they will have to deal with. Like many of you have said, you need to think of the future....will that Rei Ayanami tattoo be as wanted when you are 65 years old?
I personally have my ears pierced 2x on each ear and a tat of a single rose wrapped in barbed wire. I have had it for 10 years and have never regretted getting it.