...holy crap.
It. Freaking. Permanently. Alters. Your. Game.
Yeeeaaaah... I don't know how I feel about that. I liked that True Pacifist ending and doing this kind of thing dumps a permanent turd all over it that you actually have to go through quite a few hoops to pluck it out of your hard drive and off of the Steam cloud. And that whole Chara breaking the fourth wall crap is kinda creepy. I know it's just a simple game and a few devs having some dark fun with their audience, but geez, that's kind of messed up on a number of levels.
As someone that doesn't play evil characters to begin with in RPGs, this is seriously a high-dive plunge into the dark side like never before.
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