Does Anyone Know If Napstablook is A Male?

Hello! Since recently I've gotten into the Undertale fandom and this is one of my most 가장 좋아하는 characters, and I've seen that they have the pronouns of "They" 또는 "Them" 또는 "It's." And I've been confused for quite a while and I just really want to know, what is their gender? And I hope it's male!