Gonna look into that, characters can be extracted already, animations work too in the next (not yet released) build.
Considering such tools already exist and you're not distributing unaltered game content, I doubt anyone would have a problem with it.
It's time for a little exposition:
Developers paid monies for artists to make art assets (or programmers to make good engines etc.), ripping/altering them causes some of them to resort to lawers because it is, one way or another "stealing" or "infringing copyright" or "reverse engineering trade secrets" or "breaking file protection" (some people consider XORing files to be protection). I get that point of view.
Also "Hot coffee" happend, so publishers might fear what lurks in the game files.
Some other developers don't care or make a modular game (Starcraft II allowed really impressive mods like a 2D sidescroller, card games, also The elder scrolls games)
An active modding community can boost a game (think Minecraft) if it makes sense to mod a game. (Of course the developer has to extend a hand, just a tiny little bit)
For example: Fighting games have their rules for the game set (M.U.G.E.N. does not count *wink*) to make it balanced.
Switching backgrounds, background songs, changing the UI etc. are not influencing the game's machanics.
My personal rule is: If a developer can give me a compelling reason not to mod the game I will stop. (or if it's obvious, or damaging sales, making them less monies etc.)
If I get I get a C&D without explanaition the dev and the game are dead to me.
tl;dr:
It's up to the developer, games can benefit from modding and smart devs can use it to drive some more sales,
not so smart devs will sue you for breaking their product instead of reasoning with you.
(DRM is another can of worms that I ignored)
Oh wait, why did I write that much?
...but I haven't found another thing that does it. ...
If you just want to rip wav files out of any binary file (assuming it's not encrypted/protected/xor etc. which gfs/snd-wav files aren't)
just use the HyperRipper feature from Dragon Unpacker, it scans a file for known file signatures and rips them. (supports bmp/mp3/... files too)
Works with many games. Should work with Skullgirls.
You just don't get the file names.
Little disclaimer: I used it a few years ago, but the Hyperripper feature is still in there.
http://www.elberethzone.net/dup-news.html