Dwarves : as mercenary guarding slaves/gladiators about to be sold. Things get ugly when suddenly the 'merchandise' began to riot and you manage to stamp out their so called 'protest'. Dorian being inpressed at your skills decided he could use your talent.
You can reply with:
A. So long as there's bigger money then I'll join
B. Bored, got nothing else to do
C. I can't stomach this work anymore. If your cause is good, I'll join.
Other than Dwarves:
You were captured into slavery and quietly organizing your escape with fellow prisoners. In the slight opportunity you riot, bashing/ sniping/ fireballing your way out. Almost made it, but you are immediately cornered by Tevinter's 'police'. Upon arrest, Dorian shows up and offers to buy you instead. No one dares to oppose an altus magister.
Joining dialogue:
A. Why should I trust a Tevimter magister
B. I'll join you. For now
C. You save my life. Thanks. Shall we go now?
...
Actually I find the idea of each race living through different backgrounds a la Origins is kinda fun, not to mention I'd like to start out as a priviledge elf for a change (might be interesting

maybe as a servant to a kind House that loves her and they grant her some decent position. Bonus point if the Heir of said House has a 'something' with her and plans to make her as concubine

However the Heir did not survive chapter 1 because of *reasons* ...)
Sorry, my imagination gets the better of me XD
However, I'd rather lower the bar of my expectation since starting as a slave/gladiator/prison guard seemed to be easier done with all that having to divide resources and word budget and all..