I'm just going to assume the worst for most of the companions and hope to be proven wrong. We're probably still getting Drack (yuck) the Krogan from the leaks so I've already lost faith there, unless they've changed the name or we're not even getting a Krogan anymore.
It just breaks immersion when we're expected to have these absolute contrarian characters to assist the human responsible for one of the most serious roles in the new galaxy. I hated it with the ensemble in Mass Effect 2 but at least there was a purpose to having a cast of misfits and weirdos. Here it just doesn't make any sense.
I'm just hoping for at least one clear-headed and unique, but relatively normal character in the squad.