Oh!! Well for the most part, Frisk's personality stays the same, but except they are a little bit meaner than Classic Frisk since they were a very troubled kid who was basically a school bully on the surface, they were bitter towards the world for them being constantly being harassed by other students for not having a family of their own and for being intrigued by the legends of Mt. Ebott.

So. Like. Imagine Frisk from Undertale, but they wear a Halloween colored sweater and has a personality similar to Susie and Kris from Deltarune. That's Flipflopped Frisk. I wanted to expand Frisk's character and backstory a bit if I'm going to have Frisk stay in the same role in Flipflopped. Here is some artwork of them when they were on the surface by the way.