You can submit ideas for characters for me to add to my SSB style game, Super Scratch Bros. Extreme ( https://scratch.mit.edu/projects/854356868 ).
If you give me anything to work with (Bitmap Sprites, Attack/Taunt Ideas, concept art, etc.) the character will have a higher chance of being added.
I will try to add any character I know anything about, so long as they are Scratch appropriate/family friendly.