Underfell.

This Au is the same as the orignal undertale. Except every thing switches.

The monsters that were nice turns evil and really wants to kill you,And the monters that were evil try to help you get through the underground (which is mostly flowey and chara). Even when chara dosen't have a soul she still follows you around and tells you to not kill any of the monsters.

at the end of the pastfic route chara will congraulate you for sparing all the monsters that were trying to kill you.