He's a friggin' mountain troll. Finnish one. I don't think there's much difference to Norwegian trolls, aparently that Finnish ones seem to be filthy rich. At least sometimes.
(This story happens in between somewhere early 1800-1850.)

Nokko is pretty much a normal troll, ugly, hairy and more or less stupid. He lives in his own cave away from others and guards borders (though there's not much to guard it against but someone's got to do it) and spends his days there with his only intelligent companion, Aino the werewolf.
http://i85.photobucket.com/albums/k.....hound/aino.jpg
http://i85.photobucket.com/albums/k.....ihmisssusi.jpg
Her life as a werewolf sucks (yours would too if you were a wolf without any hunting instincts, unable to turn into human and a free punching bag to any real wolves if they knew about your humanity [there are actual mythology facts and yes, Finnish werewolves are wimps]) so she likes to spend time with Nokko where she's at least safe.

Being over fifty, Nokko is (relatively) wise enough to not pull as many crazy stunts as younger, but still strong enough to wrestle bears with one hand. Trolls live bit longer than humans and a 150 year old mountain troll would equal 90 year old human in age (not actual mythology) so he's still far from being actually old.

Oh yeah, like stated in the ref, his name isn't his real name, but everybody calls him something like that because he loves nettles. He eats them as a soup, bakes them in his bread and uses nettle water to wash his hair (true facts, these are all good).
He's pretty self-sufficient and what he can't hunt or make, he steals or buys from nearby humans who in their turn sometimes try to steal his gold and silver he has stashed away in his cave.