Streets of Rage 2X is an OpenBOR module made by Kratus. You can find the latest

This is a 2CC playthrough at maximum lives using axel & zan from Streets of Rage 2 and 3. they have much lower potential damage output than axel from Bare Knuckle 2, but their almighty jump kick is still easily exploitable and remains the perfect tool to get you through at least one of the routes in the game. There is hardly anything in SoR1/BK1 route that it won't stuff.

But to get an idea of how good their damage is, skip to the Robot Mr. X fight. That battle is brutally short because you're doing good damage anything to him while he hits you for 60 damage minimum; it's horrendous