Board Thread:General Discussion/@comment-24973452-20160905181416/@comment-86484-20170328131530

Wildkitten1234 wrote: Wasn't that changed to they in a later version, at least the digital one?

It's they/them in game, I'd consider that more canon than other offical material I don't know, I only have one version. If you find a newer one, please show me a reference. Anyway, Napstablook is called 'they' throughout the game, even though that doesn't really say anything about gender since anyone can be called 'they'. Mettaton is clearly male since everyone calls him 'he' except for that one time when Undyne called him 'they' (she couldn't remember his name, I suppose she didn't remember his gender either and said 'they' just to be safe). I don't think the evidence is conclusive for Napstablook, however, since it's 'they' everywhere in the game and 'he' in the artbook and the latter may or may not have been a mistake.