Gasp, I know how to paint (just in case the background is not mine, just a filler I found randomly on Google with no credit to anyone).

Background:
The story is very straight forward. Some Blood Elves that were on exploration further into Outland reached a cache of Netherwing eggs while their mother was outside hunting some ogres for meal. The explorers took some back to Silvermoon to experiment with, in an attempt to tamper their natural magic power to feed themselves, while others sought a chance to try to breed their own dragon mounts, knowing how hard is to happen to retrieve and tame the ones on Azeroth. One of such experiments was to create a broodmother and bend her will to the Blood Elves, however, being present in Azeroth made her Black Dragonflight genes to deviate and go crazy, making her quite wild and unpredictable. To prove she was not a failure, one of the magi was sent along with her to Bloodmyst Isle, trying to test her in real combat against the Draenei and to check her loyalty to her masters. After feeding on Draenei blood for some time, she reared back and tore her master's head when he wasn't able to defend his pet from the Eredar Sirona, who just wanted her to toss her against the Draenei troops that were encroaching around Vector Coil.

She flew from the hostile Sunhawk, reaching for a place of solace in Wyrmscar Island, where she heard the ghastly voices of another dragon, calling her to his side...

Psychology:
She has a very wild side, sometimes sadistic, and sometimes she's able to show kindness and reflect upon other's demise, specially if they were treated unfairly. Alignment wise, she's Chaotic Good, she will do everything to correct and punish who defy her own view of justice. Will never hesitate to go there and stomp on whoever hobbles the free will and individual freedom of the others, for she values freedom and self-restrain over the restrictive views of the law that renders the others unable to act for themselves. She hates the weak of mind and can go from a simple slap upside the head to maim the weak until she knocks some sense into their skulls.

Biology:
Since she's a netherdrake, she has the lingering power of the original Black Dragonflight infused with the nether energies from the Twisting Nether, making her body rather translucent and ethereal. After getting more conscious of herself, her powers allowed her to morph to a more "compact" form. She either will morph into this red-devil guise, to try to tease Warlocks, or morph into a Zandalari troll, as she thinks they are the only real powerful race in that planet (barring the individual heroes from all other races). Her full form as a nearly mature wyrm grants her the power of her bulk and her powers are not restricted by size. She gains more power momentum when she can tamper into the Twisting Nether, be it by just reaching Outland, her old home, tapping the portal of a Warlock or directly draining and eating demons, for what some mortal races are very grateful to see it happen. She can drink Fel (demon's blood) but too much make her drunk and unable to distinguish friend from foe. Likes to eat fish but will relish anything that her maws are able to crush, even Mogu or Earthen.