My last post only addressed the palette question because I was at work on my phone. I'll address the other stuff, now.
Seth Zankuten's Spidey was already well done, but he had a few new moves that I felt made him kind of cheap. So, most of the credit for Spidey's slick gameplay all goes to him. I really do appreciate all the positive feedback, though.
In MvC, throws are executed by pressing Forward+HP or Forward+HK when close to the opponent. And I personally prefer it that way.
The portraits are done with mugen 1.0's default screen pack in mind (because I use a slightly modified version of it). The versus screen shows the portraits in a "window" in the traditional 120x140 pixel size. I have my win screen portraits set as the same sprite as the main portrait, so the full image is shown on the win screen, like so:
Spoiler, click to toggle visibilty