Jabes.plays.RPG says:
The concept is this: PC is a victim of racism - dragonborn were forcibly conscripted into a conquering army as slave soldiers / cannon fodder. Except that with his magical powers he along with similar others were turned into walking cannons themselves. Ultimately this army lost in another war and the slaves freed. But by then there was no going back to previous lives. Home was destroyed or lost (on another plane, maybe). I'm still deciding. PC is either trying to get home (motivated by love), or just a wanderer motivated by curiosity, a sense of adventure, or greed.
I'm trying to come up with a good background for this guy. Soldier as it is in the PHB doesn't work for me. Any suggestions given the concept I've described?
I like foolsmask's suggestions. In addition, you might consider rolling a random background (1d13) to determine what you were BEFORE being enslaved, and use that for your personality, ideal, and bond, while using one of the flaws from the soldier list. That would represent that your base self was determined by your life before the war, but that the war and slavery scarred you, naturally. Sometimes I find that my character concept works better if I pick personality, ideal, bond, and flaw from different backgrounds.
As a slight tweak on
that idea, you could consider a bond with regards to another character in the party; perhaps that person has helped you in some way, given that you can't return home and are probably pretty lost in this region/on this plane.
If you're going really alien, perhaps the dragonborn culture of origin doesn't recognize the method of your freedom, and you're looking to complete a period of indentured servitude for one of the other PCs (who naturally doesn't understand), or to complete the ritualistic nature of a societally normal period of the slavery. Perhaps, for these alien dragonborn, a period of servitude and battle is part of a passage to adulthood, and to complete it, you need someone who has been witness to your good service to return with you to your plane and give ritual testimony. Service is a period of everyone's life, back home, but out here on the material plane, you have been the butt of abuse and racism, which is bewildering as well as terrible.
Finally, you could always come up with your own flaws. For instance, here's a suggested list of some things that might be on a flaw table, for someone who's been a slave to a brutal, conquering army:
1 - I have a strong fear/hatred for the race of my former "owners" and/or the enemies during the war.
2 - I find it hard not to obey anyone of the class or race of my former "master."
3 - I've come to believe that the only value I have is as a rampaging engine of destruction.
4 - I'll do anything to curry favor and avoid anticipated punishment.
5 - I react violently in any situation that reminds me of the war.
6 - I have developed a crippling empathy to anyone downtrodden.