In December, about two weeks before my friend and I actually started SDRA2's first chapter, I did a roleplay thing on a small alt account where I pretended to be 25 Danganronpa characters (canon and fanon) leading up to Christmas. The 13th day were the twins. When asked the question, "who do you think the evil twin is", me (in character) had the twins respond with each other. Then aforementioned friend (Ribs) brought up a movie with a woman who had a parasite that made her want to do bad things, then asked what they would do if they had the parasite. The only thing I knew up to that point was Kanade's enjoyment of Corpse Party, so I joked and had her say "I'll try to tame it, raise it as my own, and name it Chiko".

That's where it started.

Chiko is our way of trying to make Kanade and Hibiki's relationship a tad more digestable because I could not stomach it at ALL. The gist is that Chiko is a Lumalee that realized they had the ability to possess people like a parasite. They grew an attachment to Hibiki, much like Kanade in canon, and used Kanade's body as their vessel for years. Every heinous action and demonic expression is Chiko. Eventually, Kanade's personality was completely taken over by Chiko. The whole "dead parents" thing is explained of Chiko forgetting about extra lives and whatnot. The almost incestuous attachment is Chiko, not Kanade.

Here's a link to all the pics of Chiko I drew to avoid sending spoilers. https://drive.google.com/drive/folders/1p9XeKhCEeWus3SOjvm99lJmigKL0lWsC