Pulled Into Deltarune And Reborn In A Vessel

After the connected soul goes missing, Gaster panics and accidently pulls a different soul into the Vessel. A Soul that was ripped from their home and had everything stolen from them. All for the sake of a stupid game! Enraged by this they rip everything apart and escape. "If this world wasn't here I'd be with everyone I Loved! So I'm going to make it Hell!" That was their goal, that was their purpose, that was their new story, and they... were the Villain in it.