As of now, I've heard from secretchaos1 on page 458 that there's a work around to SFX IDs by using the boss SFXs as the clone character's SFX slots since BrawlEx doesn't support extra SFX slots yet. Maybe you can edit them by using the Replacement SoundBank Engine (RSBE)??? I have yet to try it myself since I'm still trying to work with customizing the CSS screen and profile pictures.
I'm unsure of how Brawl Minus works, but which method of the custom CSS screen are you using? Spunit262's Custom CSS Code or through the CSSRoster.dat file? Have you tried to use BrawlEx without Brawl Minus included? Maybe they both are modifying the same files, which is causing the character not to appear on the CSS.
Brawl Minus uses BrawlEx.
I have done everything required to add a clone in Brawl Ex. However, the clone doesn't want to appear in the roster even though I added them to the Css... I added it to the CSS, changed the memory for it in the Module, mass renamed the fit for it. I've done pretty much everything. I also use Brawl Minus if that says anything.
Brawl Minus uses the CSS Code. Did you add the character there?