Adding new characters, assistance please

[Chosen Hero]

I have no experience with this stuff but I was trying to add new characters like Greninja, Wii Fit Trainer, Little Mac and other SSB Wii U/3DS characters to my roster in Project M. I'm not sure what to use but I don't want to replace any characters I already have. Any tools and editing material will be helpful to note in a reply back to me thanks. *A guide for the tools etc would be cool*

[MegaGEN50]

Project EX.
Search that up, then add clones for them.