Cactot said:
...or if you really wanted that backstory you could have him use a hammer, mace, axe or spear, all simpler weapons to use and much easier to explain away through backstory. Swords are typically experts weapons, they are much more fragile, expensive, high maintenance and difficult to use than their simpler counterparts. Shield + blunt weapon, axe or spear = very intuitive fighting "platform".
ALSO, judging by the low level monsters and the human guard we have seen, it does not really seem that 1st level adventurers are THAT much more powerful than their mundane counterparts (other than the second wind and healing surges, etc), just more naturally gifted. If i see standard peasants with 10hp i will be VERY surprised, I would figure they would be at least as strong as a standard kobold.
Hmm. I thought that the 3.x "non-combattant" classes would actually look like Minions - and thus, the 4E first level equivalent of a Commoner or Expert would have to live with no or 1 hit point. (Any attack that hits kills him.)
That said:
Maybe adventurers are really a special bunch of people. Something - luck, innate talent, their bloodline, etc. - makes them stand out when facing adversary. They might have lived their entire life as a farmer, but when the Kobolds come to steal the village pigs, then they are the ones that survive the first skirmish - and press on.
Off course, this hardly works for wizards. Still, you don't neccessarily need an academy or a fully fledged spell caster to explain his abilities. Maybe the village elder gave the young wizard a book that happened to contain spells. The elder didn't bother experimenting with this, but this foolish young boy did. When he was alone, herding the sheep, he read the book, and learned how to cast the few spells in the book. When we first meet him in the adventure, he has some tricks up his sleeves - and unlike others, this young man keeps his head together and casts the spells.
On odd-ball groups with Tieflings and Dragonborn: Keep in mind that these are core races in 4E. They might not be the most common bunch of people, but they aren't unheard off.
The PoL background implies that there once where big nations and kingdoms, but they fell. This means every place has a time when things where still cosmopolitian. Today, things might not work that well anymore, but the Tieflings and Dragonborn that traveled the world during the high time of the last Empire had to settle down somewhere.
Most people might still try to avoid Tieflings or Dragonborn, but they'll avoid hostility - everybody knows there was a time where they were all united.