It means king. Which you are not.

What a Japanese person actually thinks
Reads as a claim, and a slightly comic one. There is no reading in which a foreigner with 王 on their arm is not making a joke that the reader is in on.

Meaning

Literally: king
Actually: King. Also a chess/shogi piece and a suffix meaning 'champion of' (発明王, the king of inventors).

Scores

Naturalness●●●●●

Correct word.

Coolness●●●●●

Four clean strokes. The content is the problem, not the shape.

Watch out

lowAlso the surname of Sadaharu Oh, Japan's most famous baseball player. Some readers go straight there.

Get this instead

覇気 haki
ambition; commanding drive

The quality of someone who leads, rather than the title. You can actually claim this one.

On skin

王

Orientation: either

Bold brush.