There is no chance of this being true. Undertale doesn't have the brand recognition of either of these two titles, especially Resident Evil. If Jill Valentine showed up in a Smash trailer, people would go nuts. If an Undertale character showed up, this forum would be excited and the other millions of people that bought Smash would wonder who the character was.I feel like Undertale rep would cause more talk than RE & Tekken rep.