I know it isn't an adventurer, but I love him more than all the adventurers I ever had.
Onol had a hard life. He enlisted just before a goblin ambush, and did his first and only kill there. Later, he fought alone (his whole detachment decided to desert, the hell) a forgotten woolly moose with his steel axe and dabbling capacities. He miraculously slammed it into an obstacle, breaking some limbs, but unfortunately the beast just ate his left arm. he flees in the wrong direction, have to face the beast again, manage to dodge its blows and makes his way to the hospital. Then, an opportunist speardwarf just finishes the job.
The next day, Onol takes his axe and goes to the barracks training with his friends. Not a single fuck was given that day.
But the next battle was less glorious for the poor dwarf. A strong siege force, outnumbering my army, is approaching. He charges, but the goblin spearmaster gives him a hard time. He ended in the overcrowded hospital once again, but this time with a broken leg and a screwed right arm. He is in the same bed than the previous speardwarf, that have the left arm cut open. But Onol leaves before him, with a crutch and a splint on the leg. He lost the ability to grasp and stand.
Now, he is retired. I forgot to mention that he never, ever was unhappy.