So I kinda wanna take a guess at how miss info and fold became villains right. It might be too early to speculate this hard but I sorta want to get this thought out anyway lol
So as far as I know, miss info is a tutorial npc and fold is a instruction manual/cheat sheet.
When it comes to miss info, lets say her past of being a tutorial npc had done irreparable damage to her sense of self. I think she might've been ignored numerous times after the hero's gotten well versed in how their own game works. As a npc who only serves to guide the hero, there may have been a point where the hero no longer needed her help. Say she started to conceptualize the meaning of neglect along with the feeling of being useless after everything's become common knowledge for the hero. Having dealt with a repetition of negligence, this could've been the start of her manifesting a conscious and understanding what self-worth is. Filled with agony and contempt for those who felt that she was of no use to them, it leads her to break down her core programming and becoming somewhat fractured from within. Developing a will of her own by force but is still intertwined with remnants of the original AI. This could be what pretty much causes her to be inconsistent and spread misinformation along with exhibiting a psychotic behavior.
With fold, the same also applies as he's a instruction manual/cheat sheet. Maybe back on his world, he's had pent up resentment of being ignored too. Cheats are pretty archaic at this point so who has the time to really bother with cheats?/Who has time to read instructions when the hero can figure out everything on his own(which can be interpreted as the player hopping straight into the gameplay and guessing the controls. Though, people need to read anyway. those reading comprehension rates is not looking so great rn lmao). Maybe he's also grown tired of being seen as obsolete as well.
At this point, I would guess that both misinfo and fold want a world where there's no accurate information at all, leaving the hero to struggle on their own as they make countless mistakes, a lack of navigation and misusing items. All for the sake of their amusement.
I think it makes sense for those who were once neutral to derail from their purpose after being brushed aside and looked at as an afterthought but not taken into consideration.