Hi. Just to answer your question first, like I said I'm not really a fan of guest characters in Skullgirls, so I don't really have interest to help personally, but I am very supportive of fan campaigns and it makes me happy to see passionate people pushing for changes in a constructive manner even if it's one I'm not 100% on board with, so good luck with that! :p
Anyway I apologise if my post came off as more aggressive than I intended it to be, but in the fighting game community (and just gaming in general), there has been a lot of poorly thought-out fundraising campaigns, which tend to end up with a lot of people losing money and the organisers losing their reputation and potentially getting in legal troubles, so I just wanted to be clear and nipped this idea in the bud.
Regarding a potential fundraising campaign, taking an example from the Indiegogo that funded the original batch of characters, the campaign itself was started by the dev team, who were willing and able to do the work and just needed the funding from the community to achieve it. Same thing with the campaign that (partly) funded Indivisible. So what I mean is, you don't really need to worry about fundraising campaign. If you can get enough people hyped, and it reaches the publisher or the devs' attention and they think it is a good idea, they will simply organise their own funding (whether it's internal funding or a crowdfunding). As outsiders we just need to concentrate on building the hype.