Board Thread:General Discussion/@comment-34283783-20180110041633/@comment-34283783-20180111082543

Well, as I've already stated, there's a mechanic in the game that influences certain variable events to occur on subsequent playthroughs. That is, there are constants and variables (cough, cough....Bioshock....cough cough). The underground is basically a pocket dimension separate from the original world and time, so it has its own. Also the previous human souls remains existing simultaneously when Frisk arrives wouldn't necessarily matter. So, every time a human soul for whatever reason decided not to reset, another new variation arrives.

Anyway, im not saying its a very strong theory, but I do feel like its an interesting possiblity. Also, my intentions were more bent towards presenting an explanation as to why Chara's spirit might have become attached to Frisk, and become able to take control of his Determination.