Seems brevity is what you're looking for, so I'll keep this as short as humanly possible. For me, that is. :v
Name: Asajj Wrath. Yes, she realises that Asajj can be difficult to pronounce. No, this will not stop her from beating the ever-loving crap out of you if you pronounce it like 'ass-age' or 'a-sadg'. It is pronounced 'ah-sazh'.
Nick-Name: Asajj can often be found to be called any variant of 'pissed off chick' or 'scary chick' or 'really fucking tall chick'. Or, y'know, just Wrath. She's cool with just Wrath.
Age: A mere seventeen years old, Asajj is the sixth youngest of the Sisters of Sin. Now, to say that this pisses her off would be the understatement of the ages because Asajj constantly perceives that people look down on her for her age. At the very least, she does have rather mature features, and her towering stature lends maybe a couple of years to her appearance, which you'd think would make her happy except it only infuriates her because then people look down on her even more (so she believes) when they realise how old she actually is. However, you should by no means underestimate her for her age...neither in regards to physical abilities, nor to her mental capabilities.
Gender: Female. Doesn't entirely look like it, doesn't at all act like it, seems to have twice the testosterone of most men, and seems to hate even being referred to as 'girl' or 'woman', but that's how it is.
Sister Of: Guess it's Wrath.
Appearance:
Asajj is not a pretty woman. If you expected the embodiment of Wrath to be, well, I got bad news for you: she ain't. Far from that, Asajj seems to more resemble a man with her towering physique and musculature. Standing at a clear 201 centimetres (which translates into about six feet and six or so inches), Asajj's entire body ripples with lean, powerful muscles indicative of considerable upper body strength, the product of years and years of a punishing, relentless physical regimens. Her rough skin is a ruddy, dark tan tone, covered with all kinds of tribal and war tattoos, the most prominent (and, as it were, the simplest) of which are found branded right into the skin of her bare head. Her hair is a faded black in tone, typically straight in tendency, but she's been shaving her head since she was maybe thirteen or so years old, and even before that kept it cut extremely short to keep it out of the way. High, prominent cheekbones carve out a significant portion of her features, surrounding a small, slightly pointed nose (it has something of a crooked bend at the dorsum, indicating that it's been broken more than once in the past), under which rest thin, dark lips ungraced by any artificial colouring or lipstick, often bearing an angry scowl of sorts--which, arguably, is her default expression in life. And below a wide forehead are small, vaguely almond shaped eyes of a startlingly deep green colour--a source of constant irritation to her. Someone who is constantly pissed off shouldn't have such beautiful green eyes, especially when the rest of her is so...well, anti-beautiful, to put it nicely.
Brief Personality: Asajj is Wrath. Guess what that means. Put simply, it means she's angry. Always angry, about everything, which, as it just so happens, is an attribute coupled with a frighteningly short temper and a fearsome predilection towards violence when that temper runs out (and it will, it always does). She's also ludicrously stubborn--once she decides her viewpoint, it's a god-given miracle if she so much as admits the barest doubt in that viewpoint; it's also why of all the sisters, she is the most adamant in her hatred of the Brothers of Sin, simply because she refuses to believe she might be wrong in doing so, and she is definitely the most pissed off of the sisters (as usual) about this whole situation she finds herself in. Asajj is highly devoted to physical dominance, and has spent her whole life pursuing physical strength, pursuing the virtues of a true warrior, using the gift of her natural height to her advantage; however, contrary to being a brainless bruiser, Asajj can be surprisingly insightful and intelligent when she stops to think. Problem being, she rarely stops to think.
Essentially, she's a mask of rage and violence placed carefully over an extremely emotionally isolated interior. Asajj is dreadfully afraid of emotional pain and loss, so she simply acts like a total asshole to distance herself from everybody, and responds to every potential emotional threat with the hatred and overkill that has become characteristic of her.
Theme Song: Theme song? How about
this? I mean, a song called 'Bind Torture Kill' that's all about killing? Count Asajj in!
Other: She is fully asexual, and as a result is prone to becoming visibly uncomfortable by excess skin being shown, or overt talk of sexual matters (which takes people by surprise; apparently they don't expect that of the embodiment of rage). Note that asexual does not necessarily mean 'aromantic' (yes, there is such a thing as aromantic, and yes, it is different from asexual); Asajj is 'theoretically' capable of romantic feelings for anyone she happens to develop them for, and is capable of falling in love...she just really, really doesn't want to.