With time, your route will shape according to the actions you choose – Pacific, Neutral, or Genocide. In case you start attacking, they will stab back. You can become friends with the demons if you decide to talk to them. When meeting the demons, he/she can behave differently: start a fight, stay neutral, or deal with them in a friendly and peaceful manner. As for the paths to follow, the play the main role in the game and decide the destiny of the world you appeared in (and your own, of course). However, depending on the route he chooses, their attitude will change – those that are pacifistic will support and help him, while the evil ones will be frustrated in case he chooses the nonviolent path and vice versa. He meets monsters on his way and they all treat him differently. Frisk is the eighth human being that accidentally made his way to another world.
He gets there accidentally after falling down from a magical mountain Ebott and rolling under the ground. Everything starts when Frisk, or a Human Child, appears in the world of the Undertale.
