i got this in the 1.4 version of the game, but Final (1.5D) should work as well. you can change characters as much as you want, as long as you beat the Eyedol (the last boss) with TJ Combo. you also have infinite continues. even on Very Easy this game is tough if you are not good at fighting games or familiar with this game in particular.
after using a combination of cheap moves and luck with different fighters to get to Eyedol, i was pretty much stuck losing as TJ Combo over and over. i looked at the guide for beating Eyedol with all characters, and it told me a good cheap move. hold Back, then press Forward, then RB. this will do a sliding strong punch causing heavy damage. stay on the defense and use this move when Eyedol jumps at you, or after blocking one of his hits. even with this it took a few tries. good luck!