Okay, here's one of my OC species. It's about as nonhuman as you can get, so I stuck it inside a human because I heard you like humans.
Name: Aryan / Flora
Age: Aryan is 10 / Flora are ageless
Gender: Aryan is male / Flora are genderless
Race: Aryan was human / Flora are Flora
Flora info: Flora are a hive mind species, man-made by an incredibly advanced species that was driven to extinction by their own technology. One such technology was the Flora. The flora are individual nano-machines, each the same size and having the same general structure as an organic cell. Each Flora cell absorbs heat and organic matter to power themselves and multiply. The default shape of a Flora colony is many, long, nearly-invisible, string-like tendrils extending out from a host.
Appearance: Aryan is a small child, with clouded, pale gray eyes and wispy gray hair. His skin is cold and gray as well. Coupled with the fact that he rarely wears anything, Aryan's physical appearance is frighteningly similar to that of a dead child, which isn't completely wrong. The Flora can make him appear as almost anything however, of any size or shape. The Flora are able to change color in an individual cell basis, so they can literally appear as anything.
Years aboard Precipice: Newcomer
Apocalyptic Scenario: The Flora reached critical mass in the planet's biosphere, completely overwhelming the human race that had previously had a population of over thirteen billion individuals, and moved onto the next phase in their migration cycle: the planet's core. The Flora rip the planet apart, consuming the magma core as fuel for their long hibernation until they reach the next doomed planet. Aryan was one of the human hosts that the Flora had initially used to multiply inside of when they had just arrived on the planet. Later on, once the Flora made themselves known, they simply killed all the other humans. Though Aryan had long since been dead on his own, the Flora inside his body kept him alive until the very end.
Abilities: Aryan is a normal human, albeit with an incredibly high pain tolerance. The Flora are able to shape themselves into anything they (or Aryan should he be in control) desire. They are also able to heal any and all injury, cure any disease, and destroy any virus in their host. Heat, even that of the hottest sun, is absorbed by the Flora with a 100% efficiency rate. Should they have enough matter stored or readily available, heat will fuel rapid multiplication of the Flora.
Skills: Aryan was good at checkers. So long as Aryan remains dominant, he can command the Flora to take any shape he desires.
Short Bio: Aryan wasn't his original name. It was Christopher, Christopher Maltese. He was ten years old, with light blonde hair and shining blue eyes. The media named him Aryan when he started showing up in cities right before they were completely consumed by the Flora. Aryan had lived in a large research facility where his father had worked. His dad had been investigating a strange type of cell found in an ice core. The singular cell seemed to have both organic and inorganic qualities. Unfortunately, no one could have predicted that simple heat would have reactivated the cell, and it had access to plenty of matter just using what was floating in the filtered air of the containment chamber. For a containment chamber, it did very little containing. Christopher's father was the first casualty of the Flora outbreak, and Christopher himself was the first vehicle for their rapid spread.
Personality: None, considering the Flora are generally puppeting Aryan's dead body. Aryan used to be loud and happy, like any other kid his age. Now though, he's a lot more reserved and somber but still attempts to act reasonably upbeat for the benefit of those around him. Seeing everyone he knew and loved die, killing those people with his own two hands, all while being dead himself, well, it changed him. Underneath Aryan's good-natured facade, he just wants to break down and cry out at the unfairness of it all.
Role: Anything. That could be fighting or defending others, or healing the wounded. Since Aryan requires no oxygen and doesn't feel heat, he could be used to scout stars, exploding planets, or simply work outside the ship. He'd be total overkill for security, but that's never a bad thing. The Flora would fit any situation equally well, since they were created to be the perfect biotechnological weapon of mass destruction, and Aryan would simply want to serve a purpose. The only role I don't think he would be able to do would be research.
Other: So as not to have a self-replicating mechanized monster of death aboard the ship, how about the initial abduction/healing process makes Aryan's the dominant mind? It would be a simple matter for the Precicpice to recode the Flora to recognize Aryan's will as the overriding command.
Looking at the other CSs, I seem to have misinterpreted what OP meant in context of any-race-imaginable. *shrugs* No regrets!
Edit:
A How-To Guide to Dealing With Those Pesky Flora:
The Flora start to shut down and go into a dormant state to conserve energy when kept in temperatures below freezing for too long. An EMP would stop them for a few seconds before they absorb more heat and reactivate themselves. Individual cells can be destroyed by just about anything, but the heat most forms of destruction release is usually enough to fuel the creation of new cells. Extreme cold and black holes are really the only way to be sure. Containment would be the more realistic option, and that could be followed up with extreme cold.