His real name is unknown to all but his employer, Edmond Dantes / The Count of Monte Cristo. Once a sniper-for-hire, Q owes his life to Edmond, and would give his life for him. Also an outsider, Q migrated to Dexterity following Edmond two years a go.
He keeps mostly to himself, and doesn't talk much. When he does speak, it is usually something that needs to be said. Q smokes clove cigarettes, wears sunglasses all the time, and has a passion for music, popping in a CD whenever he is alone in his room.
Ever since Q came to Dexterity, he was drawn toward Tali. He always was attempting to find a way to truly kill her, once and for all. As revealed in chapter one, Q finally was able to shoot her, and in chapter three, take the girl back to his home.
Now that the girl is in his possession, he still seems drawn to her, but can't seem to figure out why. Q will lose himself simply staring at her.
In chapter 13, Edmond catches Q unknowingly try to steal Tali's Soul. Q's Resonance Soul is named the ”Soul Stealer”. He has the ability to steal souls from others and place them in other bodies, even his own. It was he who separated Opal Koboi and Aine. Aine resides inside of Q's body.
With the limiter on him, he is able to remain himself with another soul inside of him, uninterrupted. Without his limiter, the two souls will eventually merge together to form one. As Q's limiter continues to break, he gains more of Aine's former personality, and the ability to use her Rez, if she had one.
Q is not educated in The Prophecies, and doesn't know that as the Soul Stealer, he is doomed to merge with the Pheonix Soul. Edmond tries to protect him from this, but since Q is left confused and punished for seemingly no reason, Q believes Edmond has betrayed him and takes things a step too far to compensate in chapter 15.
By the time Chapter 18 rolls around, Q's limiter has broken completely and he had fully merged with Aine, making him somewhat of a crybaby. Possessed by Shoy, Q was forced to merge with the Pheonix, and then place his own Soul, with the Pheonix's, inside of another body, named Sin. This was a catastrophic event- The Soul Stealer never should have been able to move his own soul into another body. As the souls transferred, Shoy's original body died and he found himself trapped inside of Q's. Q's soul is inside of Sin, but as the Pheonix Soul has described, “is asleep” and “is not doing his part.”
Eerily enough, the Pheonix Soul has referred to Q as her brother, and when she found herself inside of Sin, she remarked “Why am I not inside the Talvian?!”
The Pheonix calls people by their species or their Resonance soul. This would mean that Q is not human after all, and might just be some sort of werewolf, which Edmond joked about when Mercain came over in Chapter nine.
The hints of Q not being human are aided by Shoy's remarks at Q's body being odd. Q's eyes are extremely sensitive to light (hence the sunglasses), and he can see perfectly in darkness. It was also mentioned that Q may have had two different types of ki.