anything you want...in invisible ink.
I would say **Don't Do It!** but not because I'm a prude - just picture yourself as an 80-year-old, in the nursing home or at home, visiting with grandkids...
"Um, what does that chinese character mean on your neck? And, what were you thinking?"
Make things easier on yourself and get a Henna Tattoo - but a permanent mark on your neck? I think you'll regret it.
I have a tattoo of my wife's name, with some tribal, but it's on my upper tricep, not showing it off much. At least it can be hidden if need be.
Job interviews and the like are not exactly easy after a neck tattoo...just sayin'.