Old: Turn-based combat. I'm fine with active stuff, but their implementation of it seems to be getting worse by the game -- the combat was one of my least favorite parts of XV. I like having time to strategize and being able to properly manage my party's abilities.

New: A main female player character who isn't stoic and nearly emotionless, maybe? I love Terra as much as anyone, but the only other female lead is Lightning. More variety, please. Let's have a player character like Tifa or Rydia or Ashe.

Borrowed: Tough one, but I'd kind of love it if the next game borrowed GTA V's seamless button-press swapping between third-person and first-person play. It's not often that you get to see a gorgeous FF world directly through a character's eyes, and I think it'd be at least something cool to have.