Blonde haired, blue eyed man,
Sharp, pessimistic, very defensive.
Various drugs
Halo grew up in a loving family, full of truly extraordinary people. But it all came crashing to a halt, when they were killed for their hereditary talents, when Halo was just a teen, leaving him and his twin a s the only survivors. The man found a living afterwards selling himself, and soon ended up hooked to drugs.
Once an aspiring musician, the talented guitarist decided he refused to end up refuse, and instead began to deal drugs, rather than be just another user. This being his sole income, the 20 year old, remained addicted, and though he was good, and his market wide, he didn't spend the extra money he made, choosing to live in the slums still, despite his increase in financial situation.
What was the point of leaving after all? His philosophy had changed from a happy innocent, to that of life sucks and then you die.