This tattoo is claimed to say: “Invisible Man”.
It’s always fun to make up stuff in a dead language. nt pr ˁnḫ is one brave such attempt. I can only guess whoever did this meant the verb ptr “look” (should be with the [EYE] classifier), with the negative marker n, and finally ˁnḫ with the [HUMAN-MALE] classifier translates as “man”. Still, the result would be translated as “Man didn’t see”, a negated active statement. The best way in my opinion to express “invisible” is with a passive participle, along the lines of:
s tmw m33 “A man who isn’t seen”