Board Thread:Questions and Answers/@comment-44074436-20191130071403/@comment-34368001-20200108232851

Basically Chara deletes the entire timeline/dimension and makes it nothing more than a blank void. The only way to bring it back to normal is to reset it but at the cost of Frisk's soul. Remember, this is the anomaly/player controlling Frisk that gives Chara Frisk's soul, not Frisk themself. Anyway since it's a matter of restoring dimensions the other NPCs are deleted along with the timeline so they're ultimately irrelevant.