Board Thread:General Discussion/@comment-14248438-20160214170304/@comment-24633236-20160214171428

I think that the MettatonxPapyrus ship started because Papyrus says that Mettaton is "his favourite sexy rectangle". Not because of the shipping Mettaton should be female. In fact, the ship isn't canon and it could be shounen-ai.

This said, all the characters in the game refer to him with "he\him" pronouns. So, Mettaton should be male. The only thing that we should ask about his gener is "Was he still a "he" when he was a ghost?", that depends on your headcanon because it's never stated.

tl;dr: It's canon that Mettaton is male, but Happstablook could be anything. But I guess that you can have your headcanon on MTT's gender.

Sorry if I sounded mean, or if you can't understand anything because of the bad english. :)