There have bee no skips found for this game unfortunately, this game is very hard to break since there's no way to clip out of bounds or past a wall. The closest thing we would have would be the ladder skip in chapter 2.

Very late on this but yes, All Characters is basically playing through every character on the "One Player" arcade mode of the game. Sasuke/Kakashi with Sharingan, Nine tailed naruto, and Mizuki are included with this run as well as you can see in my WR (which has a vid).

Apologies for not getting to these threads sooner.

As of right now, we don't have any separate categories for Co-Op runs, though if you and a friend ever decide to do one, you can submit both your names in whatever category you want to run and it should show up fine. We have our max players for each category set to 2 in case this occasion ever rose up for people wanting to do Co-Op. 🙂