Board Thread:General Discussion/@comment-24973452-20160905181416/@comment-35757757-20180607201348

Napstablook is referred to as a they. Mettaton is a he (he’s referred to as male), but I don’t know about Napstablook. Apparently “Dapper Blook) is a play on “Dapper Bloke”, a term used to describe dapperly dressed people, usually male. So, while Napstablook’s official gender is unknown, they’re probably a he.