Azra = blue
Kalani = green
Siva = purple
Talin = pink
The face looks the same (probably is the same), but they have different wig styles and outfits in goth or punk themes. Read ... additional fashions, yes! Most of the Vampire dolls listed above are also available in these themes:
Zombie dolls play "beautiful human girl by day or mesmerizing zombie by night"
Grimm dolls play fairy tale girl or masked forest creature
Articles on the Mystixx DollsOf Toys and Games sales site
(P.S. can anyone explain how Kalani can be a vampire AND a vegetarian?)
Reviews of the Mystixx DollsEmily Toy Philosopher
Ashley Confessions of a Doll Collector
jpopluvr1000 Mystixx Zombie Azra review
Monica J of Sofamilyonline
Mystixx on Social Media
Mystixx dolls have a Facebook page in addition to a Flickr Hive site brimming with photos of them. Play Hut claims the brand on their website.
Happy viewing and reading.