Skullgirls' sprites have proven notoriously difficult to rip, as a byproduct of their lineart, shading, and coloring being separated into three different encrypted file formats.
Fortunately, an art compendium has arisen which has led to a glorious 1080p+ framedump of almost every character in the game. In the interest of seeing more Skullgirls shenanigans in MUGEN, I'm going to (very slowly) upload the complete framesets of select characters.
Fair warning: These sprites are VERY LARGE and will probably require re-sizing before they're suitable for MUGEN. They're also a hefty download, which is why the characters are individual downloads as opposed to a massive 2GB abomination.
Peacock:
Spoiler, click to toggle visibilty

Peacock's framedump includes some interesting unused animations, such as a much more intricate intro and a scrapped super!
https://mega.co.nz/#!khsVXBiY!c7xIDAqR-G0HUmcbi27TLArpTScYCJ-7TEwbzffQ4yY
Filia:
Spoiler, click to toggle visibilty

Filia's complete framedump, including unused (and saucy) taunts and timeout loss poses.
https://mega.co.nz/#!t0cDxBSQ!WnqYrQIckywpw2die2YsAxya3yBm9aeeHwNY0B5PG5k
Valentine:
Spoiler, click to toggle visibilty
Painwheel:
Spoiler, click to toggle visibilty
Parasoul:
Spoiler, click to toggle visibilty
Squigly:
Spoiler, click to toggle visibilty
Cerebella:
Spoiler, click to toggle visibilty
Double:
Spoiler, click to toggle visibilty
Ms. Fortune (with head):
Spoiler, click to toggle visibilty

Ms. Fortune, with her head attached. This doesn't include her headless frames due to their large combined filesize.
https://mega.co.nz/#!shFDzR5a!LfaDSSn2kt-2NXtWcjHhJDGvqI5Utnn79vW3dWeSOx0
Ms. Fortune (without head):
Spoiler, click to toggle visibilty

Ms. Fortune, with her head detached. This does't include frames with her head on due to their large combined filesize.
https://mega.co.nz/#!N1dX2BRJ!a4Y6K3DsAlkkxY2hml1mKgv0wTF_vUHONvhgu7hDIRg
Big Band:
Spoiler, click to toggle visibilty
More coming later!
These framedumps are not perfect, unfortunately. As a byproduct of the ripping process, certain things (like Filia's pupils) are transparent. I understand that this is obviously not ideal, but I hope that you can still manage to make good use of the assets. Filia is the only character whose rip should be affected significantly by this bugginess.
Additionally, as a select few of these animations went unused, they are not cleaned/finished to a satisfactory degree. Use these unfinished animations at your own expense! Or clean them up. Or ignore them, iunno.