Hi Cyangmou,
You are kind of right, I think personally I would be more interested in side-view characters (platformer / action) and FX, but more expanded paper doll assets would be nice too. Itch kind of lacks high quality character / monster sprites & FX at the moment. That said, don't give my words too much value. I'm doing gamedev as a hobby sometimes next to my regular job, and every once in a while I buy assets that I like and experiment a bit, so I doubt I'm representing your average customer. :')
I did have one question regarding the license: It says that it's for 1 media project, but prototypes are allowed. How are public demos categorized? For example, is a gamejam game a prototype or a game? I guess I'm trying to figure out where the line between a prototype and a real (free) game ends for you.