I give you the sprite sheet that contains all the 165 characters in the rom, I didn't compress the png file for some reason, I just uploaded it on imgur.
In my opinion, the back sprites that need to be improved are the androids 14 and super 13, the evolution of Cooler, spopovich, yakon, bujin, olibu, and janemba 2.
But you can do as you want of course, I just let you the sprite sheet so that you can edit any sprite you want.