Steampunk villain creation contest

http://twitpic.com/2524k4 (<--- Yeah, I fail at shading)

The Baron. Real name unknown.

Backstory:
When he was born, The Baron had a vicious disease in his left arm, so to prevent it spreading, his parents amputated his arm. The Baron was born into an extremely poor family, in a world run by evil gangs. His family was expected to pay tribute once a month, and when The Baron was only three years old, his father was killed because they didn't have enough goods to tribute. After that, his mother went into solitude, and The Baron was raised by his older brother. When he was seven, he was given a surprise birthday present from his brother - the left metal arm he uses today. For the next four years his brother taught him survival skills and various other things which would help him later in life. As he learnt, he added new bits to his robotic arm, ever so slowly tuning it up. Life proceeded as normal until on the month after his eleventh birthday, when the gangs decided to visit his family again. After not having enough to tribute, the gangs threatened to kill him to teach his family to show respect. When his big brother stood in the way to protect him, the gang took him and badly beat him up. Unable to watch anymore, The Baron stood up and fought them, using knife skills his brother taught him to kill one of the men, causing the other two to flee. Just before he died form his wounds, his big brother told him to fight to survive in the merciless world. With those words, his brother slumped over and never spoke again. A few weeks after that, his mother died from unknown causes, and The Baron was forced to leave his home and survive as an orphan. Not much is known after that, besides the fact that he honed his skills even more, and was eventually hired as one of the world's most deadly bounty hunters. He be believed to have lost his sanity and will slay anyone who gets in his way.

Personality:
Cold, unforgiving, and relentless. Doesn't like to talk.

Likes:
Firearms, mechanics.

Dislikes:
Basically everything.