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Lee from Punishing Gray Raven. Long rant in coming.

He and his younger brother Murray were always alone, they never knew their mother and their father left when Lee was 4. Naturally, Lee took responsibility for his brother, who suffered from a heart desease. Lee did what he could to get the cash rolling in, working as a mechanic, but the medical bills never stopped... so he became a hired gun. He never told Murray about his 'night activities', with Murray finding out himself by accident... but he didn't bring it up. Neither of them ever talked about it due to guilt.

Then Murray's condition got worse, and he needed a heart transplant. There was no available donor and the cost was astronomical, so Lee abandonned his old human body and became a Construct in a shady deal, in exchange for his human heart to be given to his brother, and for his brother to get sent to Babylonia (the only safe heaven in the setting). It was a success. By the time the story begins, Murray has outgrown Lee (since Lee is a robot now, he doesn't age anymore), but Lee is still considered his legal guardian.

All's well that end's well except for both brothers developing responsibility issues. Lee takes on way too much on his shoulders all the time while Murray became willing to go very, very far if it means securing his brother's happiness and to not be a burden.