http://www.youtube.com/watch?v=TIpSyPU4mNE
:09 seconds. Look at that, Shadow, Cloud, Sephiroth.
How the heck do you do that?
I ALSO WANT TO KNOW THIS
Go to AS1nk's thread. He tells you how to insert that stuff.
It's all just using Brawl Box to replace the various files in common5.
EDIT: didn't watch the video, just assumed you meant replacing the portraits. Changing the layout is done using the CSS organizer, which you can google to find out more about.