[b]Name:[/b] Elvanffryn'kacha Aleanviir't'tar, or 'Elf' for short.

[b]Age:[/b] Somewhere around 500.

[b]Gender:[/b] Female

[b]Appearance:[/b] Take an elf. Good? Right, now paint their skin pitch black, make them a bit smaller, and turn their eyes an oddly heterochromatic red/purple combination, and VERY long white hair. That's a good start: you've got the drow! She varies a bit from the norm, seeing as she's got a surprising layer of muscle, and a bit of padding over that; the sheer amount of food needed to keep up her lifestyle more or less explains how an athletic elf can overeat to that extent.
And, being a drow, she's smaller even than a normal elf. In Elf's case? About 4'7.
Now, her outfit is definitely non-standard for a dark elf of any description: they aren't known for wearing one-piece swimsuits with sandals, even if they are in black and gold, and these non-existent swimsuits definitely don't have animal fur for shoulderpads... with eyes on it. And these non-existent swimsuits [i]definitely[/i] don't become even more revealing bikinis that are immensely spikier.

[b]Canon, AU, or OC?:[/b] OC.

[b]Universe of Origin:[/b] Some D&D world with both the Underdark and a certain fabric from another universe.

[b]Personality:[/b] Elf lives to fight. Sure, back when she was young, it was probably more 'I refuse to be a cleric', and then going off to join a martial order as a much slower method of gaining political power. But, as she grew, and got through the political intrigue unscathed, and perfected her skills... normal drow politics became increasingly irrelevant, as she worked out that anything short of an all-out magical assault was doomed to utter failure, and then even [i]that[/i] ceased to be a problem about the time she went and found the immortality potion. So, where did that leave her? Bored, wanting to explore, and wanting to find people worth a fight.
So she wandered the length and breadth of the world, beat up dragons, got rid of the Tarrasque no less than three times, deposed archmages, stopped a demilich from gaining the ability to manifest anywhere he felt like, took singing lessons, and joined half a dozen monastic orders in the search for meaning.
She still hasn't found anything more interesting than fighting. But at least she's gained some sort of morality.

[b]Abilities/Weapons:[/b] If you stripped Elf of her equipment... you are still face with an immortal (thanks to a potion) elven master of martial arts, with a particular affinity for disarming her opponents and suplexing them into the ground. She's also far too damn [i]fast[/i] to seem reasonable. Encouraged by being born in the subterranean caverns of the Underdark, she's also a master of getting around without being seen or heard... so if you knocked her out, stripped her, and locked her up, she'd just smash down the door, sneak to where you stashed her stuff, and be off without a word. And she won't be unconscious for long; through sheer stubborn determination she's gained the ability to regenerate damage at a freakish pace.
On top of all this, she's skilled enough to reflect basically any ranged attack back to its destination, and is nigh magic immune on top of that. Truly, not someone to be trifled with, even if they're in the nude and on fire.
Being Drow nobility, Elf even has some magical toys to add to this: creating a pool of nigh-impossible to pierce darkness, outlining her targets in flickering illusory flames, making odd light, and levitation, for the most part. She's somewhat better at hitting targets thus outlined, or indeed fighting in darkness.

Her outfit, however... it's a Kamui. It's intelligent, and in this case can even talk. Imbued with true magic on top of its own constituent material, it's also developed a few odd effects: a continuous dramatic wind blowing about Elf's person, an invisible servant to do things for her, and telekinetic tricks for its master--plus boosting her stealth skills further with invisibility so long as she avoids violence. She can even regenerate lost limbs whilst wearing it. Mostly, though, it provides the standard attribute enhancement, has flight capability... and upgrades her magic resistance to the point of immunity against various effects.
Its name? Hiketsu. It's also her best friend.

[b]Backstory:[/b] Err.... see personality. She made Hiketsu herself, when she was trying to work out how to get some of the fun enchantments you could get on armour onto her clothing.

[b]Faction:[/b] UMMA