Don't know if you guys are interested or not (or if there's already better stuff out there), but I made a short video of some corner BnBs for Jax. Barely anyone seems to be playing as Jax online (maybe there's more, just in game modes I'm not playing?) but he's really fun and really easy to use. I used the wrestler version here, but as far as I know this works for all of them (Gotcha grabs might not work in Pump Up?).
https://www.youtube.com/watch?v=u3_kPJSTZsU
I only included corner combos because of how easy it is to get people into a corner. At the end of the video it just shows some short strings and how far they launch the opponent, even blocked you can just keep it up until your opponent eventually tries to do something, sometimes they'll even just randomly stop blocking mid-string.
I tried to show a variety of starters (advancing, low, and overhead) as well as a decent amount of finishers. The combo you use depends on how comfortable you are with the combo/how good your connection is. Like the meter burn starter is a lot easier than the non-metered version, but obviously wastes meter. Some are easier to connect but do less damage, etc.
You'd be surprised how easy it is to hit people with 3 or 4 d3s in a row after they've been trained to watch out for your f21, a lot of people just stop blocking against Jax. If that's not enough, he has some of the best dialogue in the game.
"You think you're bad? You ain't bad."