Npc's don't really have a background in the traditional sense. I mean, they're npc's that you created for guild functionality. They're basically enemies with standard game AI that possible assailants would have to fight to get to the main guild areas. That being said, since npc's are customizable, you could say those bits of text are just flavour text descriptions you gave them when creating them. :P

And to be honest, a description like that might be good. As their personality in our rp would be determined by that flavour text. I will probably write something similar for the npc's I create. :)

Also, please don't forget that this rp will have a D&D-like setting. As in, there's a lot of fantasy involved. Demons, angels, orcs, dragons, magic outrageously unpractical gear giving huge defensive/offensive bonuses because game mechanics, adventurers getting 'quests', and all that jazz. Not saying you should change your characters. I already kinda figured you would go with a more historically accurate style. Just making sure you know what kind of rp it is. :P

EDIT:
A note on your weapon of choice. That's a Zweihander. My favourite realistic 2-handed melee weapon. :)