Ok in case we want to go with the earthbound here goes...
Jack Nova, even though it doesn't sound like a very tribal name, it is. Jack is an "Earthbound one" from either the distant past of the Keystone timeline or modern day Zeal.
Jack's whole life has been spent with the extended family of his village. No one comes into the village thats not born to it. The endless winter makes travel impossable, the only time anyone travels is when the men make hunting rounds. In fact, most of what the village eats is animal, plant life being very scarce in the tundra. Because of the steady diet of protien, Jack, aloing with the rest of the village, has a very stredy build. Jack is about 5'8'' and 230 lbs. Also because of the thousands of years spent in survival mode, jack and his tribe have hieghtened senses, espesscaily smell and taste.
Language isn't well developed in the tribe, people usualy speak to each other only on matters pertaining to day to day life and survival. Because of this Jack wouldn't be quick to understand abstract thought. Women are revered in Jacks tribe because it is through thier cycles that the village can measure extended amounts of time(there is no sky to see the moon becuase of either storm clouds or floating continets, and there are no seasons).
From a tribe that has never known war Jack may be at a dissadvantage but it wouldn't take him long to translate his hunting skills into combat abilities and considering his build he should be able to hold his own. Weapons he carries include knives, harpoons, hatchets, nets. He would think of these more as tools.
Reason for being chosen:
If we're doing the Zeal timeline Jack then we could say that he got kidnaped for the purpose of slave labor, then escaped with the rest during the jailbreak scene.
If we're doing the Keystone from the past Jack then I guess he would get picked the same way the nba drafts players nowadays, purely on potential. I figure the hard life, plus a strong build and heightend senses would make for a good person to have on your team, if you can give them some magic first then let them spend four years back home trying to learn how to use it.
Feedback is apreciated.