Plz remix this, m8. Just click "See inside" and just do what I did. Hope it helps ,m8. So yeah, just add yourself to the character roster. If you don't how to add yourself to the roster click on the tutorial or just "See inside" and I've created this whole project. Click on each character boxes to change alternate costumes.
Credit to PenguinBoxhead for the original. I added Flame. His costumes are: Orange Fire: Default Blue Fire: Resembles Splash, Flame's rival. Orange: Resembles Flame's Blaze Mode. Blue: Resembles Splash's Typhoon Overdrive Mode. Black Fire: Resembles Darkness. White Fire: Resembles Light, without the white skin color.