ayuna the red player

After destroying her timeline she killed chara and killed the human race those who witnessed her analation and survived her ever wanting destruction called her the red player she entered the game and took the place of frisk so no one knew who frisk was frisk was stuck in the void with gaster just watching the destruction happen no one could stop her. When she finally erased that universe she was given the title of a realm breaker her story was told through the whole multiverse they feared her and those who tried to stop her died faster then expected those who haven't met her only think of her as myth.