Amrit the Fleshless.
Once, over five centuries in the past, the dim and simple Gnolls had a grand empire that spanned the whole of the region between the Hurichah mountain range and the Featherwind Cliffs. The Gnolls were industrious and intelligent; with a powerful grasp on magic and technology, their army was mighty, and the figurehead of their militaristic forces was Amrit.
Her name meant ‘fist of God’ and that was what she could strike like on the battlefield. Seemingly unnerved by pain that would strike down any other soldier, able to wade through combat for hours, even days without slowing, she was truly a force to be reckoned with.

A neighbouring race of bipeds rose quickly to power, and spilled into the Gnoll’s territory like a swarm. The Humans had advanced. By the time the humans arrived, the Gnolls had amassed their defences, and managed to hold off for just over a day before they were simply overwhelmed by sheer numbers.
Within another day, there was almost nothing left of the Gnoll Empire.

Amrit had fought long and hard, and struggled against her bonds with enough strength to pull a man astride a horse from his mount, and in the confusion throttling another human male in gold-plated armour.
This was her fatal mistake.
She had assaulted the Prince of the human’s expanding empire, and had very nearly killed the boy. She was dragged by her ears to the king’s chambers, where she was savagely beaten to within an inch of her life, and then dragged down to the torture chambers. The Emperor, as unpleasant a man as he was, decided that instead of removing her tongue the torturer remove her voice box through her mouth.
She, of course, did not survive the proceeding torment, though she did struggle against her bonds enough to tear flesh from her jaw, shoulder, elbows, her midsection and her lower legs. She drowned in her own blood, and was promptly buried in an unmarked grave along with the rest of her dead people. The Emperor, however, did not leave it at that; he made sure that she couldn’t possibly go to the afterlife with her kind by having her buried in a Mithril and Iron casket, the box supposedly capable of holding the soul of those interred within forever.
In truth all it did was almost stop decomposition completely.

Her body lay in the casket for five hundred years in almost the same state, never moving. Eventually, the iron and Mithril box was dug up and dragged to the surface, and the magical properties of Mithril had preserved her corpse just enough for a demon, Cha’rangphal, to grant her a part of his essence and revive her. After the initial confusion, she came to accept that she had been dead for five centuries, and vowed to bring the Gnolls back to a more glorious civilisation once more, to revive their now dormant intelligence.
Her first interaction with another Gnoll was the Team Kid, Alvita Fuzztail.
Admittedly, she’s not had high hopes for accomplishing her goal any time soon.

Her only other goal is to one day be fully revived. After a short conversation with the Team Leader’s father, Corbell the Thunderer, she now knows that she must either drain the essence of a particularly powerful demon completely dry, or be blessed by the Titan Twins to regain her mortality. She has not told this to the Team Demon, as he is likely to volunteer his own life, and she values his companionship too much to risk him telling her to kill him.
As the Team Undead, she brings her near immortality and potent strength to the field of combat. Though she cannot speak, lacking a voice-box, she enjoys conversation with others, content to listen.
Her personal dream is to become mortal again, so as to be able to take a hot bath without smelling like a boiled salmon.

I’ve changed her model slightly, her clothing is no longer armoured, and she doesn’t bear the arrows in her shoulder any more, as by the time she got to the Emperor’s chamber they would have been removed anyway.
I like this version of her; she appears more mature and slightly more sorrowful, which is what I was aiming for. *She does still have a tail; it’s just drooping and as such does not appear.