It's like how Matpat is Ness is Sans, who is also Patrick Star (because "maybe it's the way you're dressed" and Matpat is short for Matthew Patrick), Gaster (I think Sans is one of Gaster's pieces, which could also make him Papyrus) Jevil, Spamton (they're both possessed by Gaster) Toby fox (they're voiced by him and the next few characters are, too) Queen, Mettaton, Sansfield (because of Bad Monday Simulator) Garfield, Gorefield, Odie, (by the logic that Gorefield makes Jon's life) aaaand that's all the connections I can make.