Board Thread:General Discussion/@comment-28431168-20160617130858/@comment-30438304-20170304142711

@Souhiro

They are mature, they just do some things that aren't considered very mature, but don't we all ? And I like how you put Gaster in the parantheses, because, of course, no one else oculd be their father.( sarcasm) ( also, we don't see many parents in the game. only Asgore and Toriel. I don't think that's enough for certain answers. " can a monster have a monster that's  a different species?" etc).

Your second theory lacks proof. We don't know when Alphys became the royal scientist. It could be before or after the falling of the blue SOUL( or at the same time).

No humans are confirmed to have killed monsters in the *cannon*.