This Chara... this Chara didn't really get to know their Frisk, not as well as they got to know their true partner. It had been easy enough to glean their attitude from the choices they made, even if they'd never spoken directly to Chara. And even if Frisk... hadn't been able to remember them in their timeline. And nobody else seemed to know anything about it. And, and...

This Chara hasn't mentioned their partner yet.

"And you can't think of anyone else it could have been?" Chara says, their tone suddenly urgent.