I've had 3 fan characetrs: 2 Sonic ones (Which I even payed attention to), and one to, well, nagas.
First of all, "Zhadow Nega". Worst name ever. Worst character ever. It was after a glitch with messing around in Sonic 3 in debug mode with Super Sonic. He was just SS with green shoes, grey eyes, grey gloves and was dark red. Chaos this, chaos that. He'd be a god if I didn't lose interest. I did make a wad, around 1.08 of him. Max. stats on everything, and now has all options activated, making him more overpowered than SMS and even more eye bleeding. I just started using it for testing maps quickly.
This one was about 3-4 years ago.
Then there's "Scorch". About a year, year and a half ago. In effect, a black Super Sonic with blue shoes. Changed a little onwards, but the sprites I have on this computer are all corrupted.
Lastly, due to not thinking of a name, using my own name, "Reiss", the naga. Nothing to do with Sonic the Hedgehog whatsoever, making it because I <3 Karbo and Tifalover's works, both use nagas. A bit of vore here and there with the character.
http://www.deviantart.com/deviation/59787786/