The only one that really bothers me is changing Companion's starting class, especially given what we know about the Companions:

Does Wyll really make sense if he's not a Warlock? Shouldn't changing his starting class require that he relinquish his pact first?
Does Gale really make sense if he's not a Wizard? Does it make sense that we can respec him into a Barbarian?
Does Shadowheart make sense if she's not a Cleric?

Remember the human (This is a forum for a video game):