Soulmates. That sounds really...sappy, but they don't mind sappy. They just didn't think Chara did sappy. Not that Frisk is complaining.

"Are you trying to egg me on?" Frisk teases, eyeing their rock-hard popcorn ball and tossing it up and down, as if they were weight a baseball. Definitely been hanging around Sans too much.

"I wonder if it really is random," they mutter, but decide not to dwell at that door any longer. If Chara's last attempt for candy taught them anything, it was that trying the same door twice wouldn't yield good results.