Board Thread:M.U.G.E.N Help/@comment-28502623-20160520011558/@comment-3495717-20160520020119

You'll be incredibly lucky if anyone actually makes those sprites for you, especially in such a sprite style  as Marvel vs. Capcom. For starters, that's a whole lot of work that the more professional sprite artists would likely only do if comissioned, which would mean you'd have to pay them to do it and a full sprite sheet doesn't come cheap.

We don't have a lot of sprite artists here and I can't guarantee they can accurately sprite in the style you're asking for, sorry.