Soul in Undertale (fanfiction) (My version)

This fanfiction is about me being in the game known as Undertale and its an RPG game that has two routes Genocide and Pacifist Timelines and one is where you kill every monster in sight and after you beat Sans and Asgore the last two bosses which are the most difficult bosses in the game and you playing as frisk their was another child who feel 100 years before frisk and possessed frisk and that child's name is Chara Dreemurr or in the pacifist timeline is where you don't kill anyone and befriend them all and free them and the game will be over.