I know what you need to do. But no idea how to do it.
You need to take another attack. A player cant have 2 of the same attacks. So Gohans Super Kamehameha was made by takiog final flash an d using the Kamehameha sprites for it. Thats what you need to do. Take another attack, change its sprites and give it to the char.
How? No idea i never even toutched the CCI. I find it a horrible idea to add custom characters. People rip models all over the place and in the end only a fraction of characters is balanced, the rest is just overpowered.