Yes, yes you did read that correctly.
These characters would be the best fits in my opinion.
UnderLust!Sans.
Mettaton or MettaTale!Sans.
RaspBerry.
And finally, the Player or Frisk.
Maybe, just maybe Chara would be the friend that helps Frisk/The Player ruin Regina/Mettaton's Life of Chara could be Martha.I
