"The name's Patchwork... Try not to stare too much, otherwise I'll have to teach you the manners your momma never did."
Patchwork is usually the last one alive in the crew that they are assigned, so rumors like to spread about him possibly sabotaging or killing his own crew; because of this hostility, he tends to stick to himself and is short tempered to others.
The missing arm and the split helmet was the result of a hungry Jester that he was teleported from before it could completely crush him in its jaws.
As for his other leg, he lost that to the Affliction (dont worry, hes no longer infected). He managed to obtain a nutcracker leg as a partial prosthetic and modified it to his own taste.
[he will use that shovel with deadly force if he has to.]
(via The Door of Lawrence Livermore National Laboratory In California, USA. : interestingasfuck)
More info:
This photo from 1979 shows a Lawrence Livermore National Laboratory employee opening the world’s heaviest hinged door, which was eight feet thick, nearly twelve feet wide, and weighed 97,000 pounds. A special bearing in the hinge allowed a single person to open or close the concrete-filled door, which was used to shield the Rotating Target Neutron Source-II (RTNS-II) -- the world’s most intense source of continuous fusion neutrons.