Since we are on the topic of other companions, who does everyone see Cullen getting along with.
I think Cullen would get along well with Cassandra and Blackwall. They seem to have a lot in common. He may initially be wary of Iron Bull because of the Qunari thing, but I think Cullen could get over that, and they both have the disillusionment thing going on, so maybe they could bond.
I don't see him having an issue with Varric. I could see him clashing with Sera from time to time on specific decisions but I think they'd get along okay overall.
I think Cole will worry Cullen a lot, to put it mildly.
I think at the very least he'll be side-eyeing Dorian. Cullen might approve of reforming Tevinter (depending on what "reform" entails) but I think the necromancy would be a problem. No idea what he'd think of Solas yet, since we know so little about Solas.
I don't see Cullen getting along well with Vivienne. They may both be pro-circle (assuming Cullen's views on that haven't changed significantly) but on a personality level I don't think they'd be at all compatible. She's a manipulator and a game-player, and I think given all that Cullen has been through and how much he's been harmed by deception, he'd have a pretty negative view of that, and I think he'd try Vivienne's patience in return.
"The tears I might have shed for your dark fate/Grow cold, and turn to tears of hate!"
"Farewell, my fallen idol and false friend..."
