Since I was asked earlier, here's the template that I used to make my roster image:
And here's it with the known characters, with and without the logos.
(It might not be exactly the same as what I had before; I had to make a new image to make it so it was just the confirmed characters)
I used different-coloured rectangles and moved them to the back layer to get the backgrounds, and I looked up transparent images of the characters/logos and shrunk them down to make them fit before moving them back so they're in the layer between the template and the background. (for PhotoImpact, it's Control + Shift + Enter to shrink the images; I don't know if it's the same for other programs, but it brings up a menu called Object Properties, and I can shrink the image by a percent)
Hopefully the transparent sections work; transparency is pretty finicky for PhotoImpact, at least.
SpectreJordan