Those are some impressive fakes, but they are definitely fake - the only character who was ever added to an IaMP-era fighting game post-release was Meiling, who was added into IaMP some time after the game came out. There's an entire subgenre of fanart devoted to imitating Alphes' art style, and the spritework probably has a similar amount of imitators. As for whether there is actual gameplay tied to these screenshots and gifs, you're probably better asking a MUGEN forum, for I have no idea. Given that doesn't look like a MUGEN UI though, I doubt it.