Dr.Killa said:is it be possible to make tiles in the background for the level editor with this?
and are unusable characters like alloys usable?
and whats this custom character thing?
There are codes which let you do whatever you wish. But, what you've asked has nothing to do with Brawl+ except your third question. We have a CSS (custom select screen) which allows you to choose characters that have more than 1 (sheik/zelda, samus/zss, pokemon trainer) as individuals in the select screen.
For example, you can choose Pokemon Trainer which lets you play with all 3 pokemons upon death, or choose individual pokemons.