there is a part of the original game that is unexplained, but i might have a theory what it represents. in manhole dungeon/roots section of the game, we encounter this goat monster which mirrors your movements:
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if you watched roots theory, then you know that the room in which this monster appears corresponds to the lake in hometown. i believe that this monster is asriel, as we know from ch5 weird route that hometown is in a fucking bubble and this goat monster is shown to be on the other side of the lake. there is a variable named toriel which if set to false, turns the monster into a black deer implying that dess somehow left the bubble too even if she was lost to the tail of hell.
however what i caught interesting is that in this room, if you solve the puzzle by both of you walking on the switch the gap disappears and you possess the goat monster. kris kills it when you walk it to him. what this could imply? that asriel will somehow find a way into hometown and assist us in beating up gaster? he could be an interesting parallel to noelle, instead of trying to break free out of prison, he would break into the prison to free all the prisoners. but this writing is too good for toby isn't it?