Nikki the Hedgehog is the alter ego of Sonic the Hedgehog in this japanese manga:

http://info.sonicretro.org/Sonic_the_Hedgehog_%28manga%29

My friend TailsLuver194 and me wanted to see how well we could get Sonic looking like Nikki and I think we pulled it off the best we could. Super sonic doesn't have the glasses and we're thinking of having Nikki maybe transform into Sonic since that's kind of how it is in the manga. The glasses are taken from Jeff's assist trophy model and are an external graphic so Sonic will have glasses on all his textures. But if you want to you can delete the FitSonic.pac file and just have the texture/vertex hack without glasses. We'll probably make some alternate colors for Nikki tomorrow. For this to work you need to rename the files and take out the _Nikki part and put it in the sonic folder in the fighter folder. This took all day for us, so I hope you people enjoy.

It probably won't desync people online. But ya never know sometimes.