Even though I haven't seen the guides, yet I'm new here :af:, I was wondering of how do you add characters into the character selection screen? (I've added a couple of characters in the "fighter" folder)
You can't. Only existing characters such as Zero Suit Samus, the Independent Pokemon, Sheik, Giga Bowser, and Wario Man.
If you are wishing to replace a character with another...then you would need to get the proper IC codes and files needed.
Thank you very you two. :D