I think that at the start of chapter one, as SOON as we hear toriel's voice, we take control of Kris. I'm saying that the soul wasn't always there, or it was just a average human soul, that we take control, and also the vessel at the beginning of the game is our body, just not visible all the time. I also that Kris thinks dess is dead because of the deer incident, and as well as gerson, a part of her is being taken to the dark world, making the roaring knight, and how do I think she can exist in the light world? well we say that the bunker had a dark world in it, so as long as there is two fountains, they're able to exist and move in the light world, could also be because since she used to be a lightener, she can exist in the light world, for a few seconds with two dark worlds. also that ralsei is a titan. feel free to point out any mistakes in there! or disprove it and or make it better! also share your own theories!
