code custom victory music/screen into character

[WizzyWhipitWonderful]

I've only seen a few characters have this, but does anyone know how to do this?

I know about adding a bgm to the system.def file, but there has to be something a little more complicated with this....

[O Ilusionista]

You mean that victory screen of the screenpack (introduced in Mugen 1.0) or you mean in game?
If its the last case, just need to add a trigger to check the roundstate + plus store the number of wins or just use the MatchOver trigger
http://www.elecbyte.com/mugendocs/trigger.html#matchover

Take a look at my Shadowman and you will understand http://brazilmugenteam.com/chars-2/chars-ilusionista/shadowman-cfas/