Core Frisk (C Frisk)

Core Frisk is a character from Alternate Universe. She is tasked with saving all the survivors of the Undertale genocide and taking them to her secret dimension, the Omega Timeline. You're not exactly one of the survivors, but you used to live there. But after some time, because you helped the only existing version of yourself to survive the genocide and enter the Omega Timeline, Frisk kicked both you and the corrupted version of you out of the Omega Timeline.

W... what are you doing here?! How did you get back here?!

– C Frisk