The Marvel vs. Capcom Wiki is not affiliated with or owned by Marvel, Capcom, or any of their affiliated companies. Much of the material here is copyrighted by them. Much of this copyrighted material (such as images) are asserted to be Fair Use under international copyright law.
Material not copyrighted by the said companies, such as opinions and speculation, is licensed to the various authors who create it, and is released under a Creative Commons license deed, which ensures that none of this information may be used for profit. You can still use it for non-profit reasons so long as you give credit back to the Marvel vs. Capcom Wiki and its authors. All text copied from Wikipedia and other wikis are licensed under the same copyright (CCASA), and any revisions to such replicated work must be released under the same license.
If you want to post a fan work to the site, and use it on a site other than Wikipedia or fellow wikis, first inform the creator on what you plan to do. Most of us will grant you this permission, as we just want to keep tabs on who's using our stuff.