I've got a couple of different takes on her, myself.
ANB/TEN
This one is based on the game canon established in the first two games. She's devious, sometimes evil, confused, justifiably arrogant, and very clever but also spunky. Read the
Cynder 100 to see what I mean (links to the stories are in the artist comments). I consider this to be canon Cynder since all of it was implied in the first two games.
Scary AU
This Cynder lives in a world where the Night of Eternal Darkness takes place 10 years after when it does in the games, which means she wasn't corrupted by darkness but grew up in evilness and willingly chose her side. She eventually usurps Malefor as the greatest evil and destroys the world.
DotD sort of
This is the skanky Cynder and I use her if I need to draw/write anything nasty.

Looks like DotD Cynder but has more personality, wit, charm, and overall meanness.
DLG Cynder
A joke started by a friend and I. DLG = dirty little girl This version of Cynder is a rank pervert, much to the dismay of everyone in her vicinity. Not as nasty as it sounds, but really funny. She has a huge crush on both Ignitus and Gaul (much to the dismay/horror of both) and only settles for Spyro because no one else will tolerate her advances.
AHT Cynder
Destined to be Red's love, she ran away from home when he left the elders and decided to follow the path of evil to win Red's affection.
See here for more details.
Cynder Burd
She lives in an alternate universe where everything is a bit crazy. Eventually becomes the savior of her world and is good friends with Berserker (who head-bashed her way into Cynder Burd's universe).
Cynder Bird[url][/url=http://razzek.deviantart.com/art/Berserker-and-Cynder-Bird-114973957]With Berserker
Insomniac/LoS Crossover
This version of Cynder is her good side that was exiled from her body when she became Dark Cynder. She wound up in the Insomniac universe several years after the end of Spyro 3 and was cared for by Elora (Cynder was very sickly here) until LoS Spyro set her free back in her home universe. Her existence in Elora's universe inspired such strong motherly feelings in Elora that the faun's first child, Cinerea, is a mix of the two (it's complicated, but no, Cynder and Elora didn't do anything nasty to create Cinerea; it involves fairies and magic).
Dragon of Destiny
This is just the Cynder that lives in the world where Malefor's forces took Spyro's egg instead of Cynder's. She has to save the world all while being an ordinary, unspecial wind dragon fighting against the most powerful dragons ever born.
Dead Spyro AU
After Cynder is forced to kill Spyro in the Well of Souls, she swears to avenge him. With the help of Spyro's ghost, she defeats Malefor.
Dang, I have a lot of these little offshoots of Cynder to play with.

Too bad I got bored with her. These were all ideas I was planning to write/draw in one way or another but mostly never will because I've got better things to do and am not really a Cynder fan anymore..