I have way too many to list, so I'll go over primary ones right now.
Not Sonic RelatedCharacter- Meganu Bunny
Fur Color- Yellow with purple highlights, also brown hair.
Species- Cuddle Bunny...yeah.
Picture-
http://www.deviantart.com/deviation/17307710/Abilities- Flight, drawing, and digging for burried treasure.
Story of - She's me. So...whatever my backstory is. In Aeon's universe, she's a scientist of some sort. In the Speshul world, she's a proffessional cartoonists with three kids.
Origin - My house?
Character- Eara the Iguana
Fur Color- A faded green
Species- Iguana (The first one, I think.
sad )
Picture-

Abilities- Uses a chao to fight for her. Ironically, I came up with this idea months before Cream was announced to the public. True story.
Story of - Eara has
three four stories, actually...
Originally - I made Eara on accident when trying to draw a different character. Since then I used her in my first fan story. However, Sonic characters were only ever
mentioned (though I think I planned to have Knuckles in it, I think). Eara took care of a little chao named Puni C, as well as an overlander girl whose name escapes me. She was supposed to keep the overlander girl a secret for one of the other character's sake, or something.
Vulgar Future - Before I stopped making VF, Eara was supposed to be hunting down the recolored chao, who came from the sacred garden her parents had put her in charge of. She was going to tell everyone where the chao was, so they could all go rescue their friends, Cliff and Roquette, who were being held captive by him.
Vulgar Legacy - In the sequel Eara and her mystery husband abandon their daughter, Penny, to protect the Sacred Garden on her own, as Eara did before her. Though she's never seen, she's mentioned by Cliff in VLARK (which was mostly about the space colony ARK.)
Currently - Since I never got Eara into VF before I stopped, and she was one of my favorite characters, I decided to do a spinoff series focusing on her, Puni C, and two new characters, Kiki the barracuda, and Royce the monkey (chimp, I believe). She still uses Puni C to fight, and her personality remains the same, though her look has been
altered slightly...Origin - Sacred Garden
Character- Clifford "Cliff" Borialis Ebolin
Fur Color- Blue, with black highlights. He also has black hair with pink highlights.
Species- Hedgehog
Picture-
http://www.deviantart.com/deviation/11475715/ (Old and unupdated. Sadly it's the newest one I have online that has his normal attire).
Abilities- Telekinisis, and the ability to put a shield around himself to block energy/magical attacks. Feel free to punch him with your fist though.
Story of -
Vulgar Future-Originally, Cliff was supposed to be Sonic's child, but then I figured the concept was too aloof for VF to make any sense, so I pitched it. He's a kid who has a mildly troubled past, as his parents were kind of...neglective of him. Not to say that he himself is troubled at all. Just his past. He always seemed cynical and pessimistic, though that was far from the truth. He had a girlfriend, Bloom the Bat, but he was falling in love with a squirrel named Pecan. VF starts with him babysitting his sister Roquette while his parents are on vacation.
Vulgar Legacy - He supposedly abandoned his children ten years ago, as did his wife, when in actuallity he was being forced against his will to help a mystery villain with world domination. By this time (He's 40, if I remember correctly), his psychic powers had increased monsterously, making him a powerful enemy. His daughter took after him, while his son took after his mommy. This includes in personality. *Shrug* I'll probably never finish the other parts of the Vulgar Saga anyways. Why not spoil some of it?
Currently - A side anti hero/enemy in Primal Heart (Eara's series), a member of the Devil Corporation.
Origin - The City (constantly renamed) in Vulgar Future, 2003
Sonic Fancharacters (List may end up growing)
Character- Breakdown the Butterfly
Fur Color- Peach and Blue, with black 'hair'.
Species- Butterfly
Picture- None currently available
Abilities- Flight, dancing (nothing else at this moment)
Story of - A young girl who is secretly admiring the man of her dreams from afar, too afraid to confront him. I don't know what her connection will be to any Sonic characters yet, though.
In case it wasn't obvious, she's a parody to many DDR songs, the main one being 'Butterfly'.
Origin - A city on the outskirts of the chemical plant zone.
Character- Ashura the ?????
Fur Color- Green
Species- Shapeshifter, though in the pictures I have of him he's mimicing Sonic's form.
Picture-

Abilities- Shapeshifting. Othe abilities unknown
Story of - In actuality, this isn't neccessarily a fancharacter; he's a play on the legendary 'Ashura Glitch' in Sonic 2, where, using a cheat, you can alter Sonic's pallette color to green with a black top. I'm using Ashura as the main antagonist in my Sonic fanfic,
Sonic Reflex, though he has yet to appear. He takes the form of various creatures around him, as he has no real physical form. He loves plantlife...that's all I got.
Origin - Buried deep below the city of Mobotropolis.
Aaaand I'm spent. I have over 150 characters, so unless I simply
list them without giving any information, I'd never make it out of this topic.
I may add a few more significant ones at a later date, though.