Whooo!
Name: She's only been known as "Rock" or "Troll"
Gender: Female
Age: 19
Birthday: About a year after the aliens arrived.
Appearance: She's big, and she's bulky (in the muscle sense, but not the breast sense). She's not very pretty and her skin has a strange, earthy hue to it and is quite coarse. Her hair is light brown-mossy. Oh, and she has four arms and very strong teeth that are a bit weird looking. Her eyes are dark brown, and in the sunlight it looks like the pupils shine (like an opal would).
Outfit: She doesn't have much, but the tattered slave shirt and trousers that she's been wearing all her life and it's very dirty. She also wears safety gloves, as used in mining and work boots.
Mutation: Obviously, the four arms, and her strength. She was created to last longer and work harder, as the aliens had noticed that the humans were quite flimsy. They also infused a kind of mineral concoction to her DNA to aid in the tough-making. This had an interesting side-effect that she can eat just about anything and get nutritional value from it (obviously, the less nutrition, the more she has to eat of it). This is also where her strange skin comes from – as they say, you are what you eat.
She's not invulnerable though, and with enough punishment she will get hurt.
(i.e. rocket launcher or grenade hit = "big 'ow' and even death". Whip = "are you poking me?")
Origin: She was born into slavery, and set to work in the mines.
Family: The only "family" she had was the other slaves that she worked with since childhood. Her mother was a mere birth device who had died right after she was born and it is unknown who her father was. Probably just part of compulsory "donators".
Languages: A kind of broken English mixed-with-other-words that was used in the mines.
Occupation: Former mine worker slave.
Personality: You could think of her as a mule, with more brawn than brains. She's not very bright, as they had no education in the mines, apart from knowing which mineral was what and what diamonds looked like. This is also due to her mutation. However, she does enjoy company when she can get it, and she's good at doing what she's told. If you want to get her mad though, bully someone and she'll set you straight (probably try to clobber you). She can get confused quite easily but has a heart of gold (not literally!).
Current Residence: Well, just after the aliens left, there was a cave-in and she was the only survivor of her team. Badly hurt, she was found by raiders and taken as a slave. Once she's healed though, she might try to escape because the raiders aren't very nice to her and they do bad things to people. That is, if she could get rid of the constraints and have a chance to recuperate.
... it's not too much, is it?