Aah its just an idea some people want to see added into lore. We add the ideas for bioware to judge. But i have to ask what are your top three favorites?. 
For classes?
Revenant: Yes I know it isn't realistic and it would just be like the whole Geth thing again, but goddamn they are just so cool.
Grey Wardens: We didn't get a real warden for single player so they wouldn't be restricted in what they could do with the abilities. I mean come on, the Grey Wardens were an essential plot device in the first game, and now they are completely sidelined?
Werewolf: This is already lore friendly and would be completely unique. Some of the werewolves from origins found themselves unable to keep away from battle after the end of the fifth blight and the destruction of the archdemon. With the war over they secluded themselves in the wilderness in an attempt to control their bestial side and prevent harming innocents, but now with the world yet again in peril they find themselves drawn to the inquisitions cause and another chance to revel in battle.
As for other suggestion I want Darkspawn dammit. I realize they like to chill underground but they were such fun villains in the previous games I can't help but want to fight them all the time.