Thought I might drop some banter I came up with in the Solas thread. It has a little of how I think Cole will interact wit other companions 
Solas/Cole/Sera banter:
Sera: So Solas I hear you're a fade expert?
Solas: I do extended studies on the fade if that is what you mean. Why so curious?
Sera: Can you tell me then why Cole is so annoying. "It" is starting to get on my nerves.
Cole: What did I ever do to you? 
Solas: *in a defensive tone* Well maybe it is because someone of little knowledge on his character is criticizing his prescence.
Sera: Did not expect you to have any backbone. You win this time.
Solas: And I did not expect you to give up so easily. It seems we are both surprised.
Cassandra/Cole/Solas:
Solas: So Cassandra since you used to be part of the Seekers before you joined the Inquisition, Chantry ideals must have affected you in some way. Am I wrong to assume this?
Cassandra: No. You are not wrong. If it was not for the Seekers I would not know where I would be now.
Solas: Would you say that this affects your views on Cole. I doubt the Chantry supports working with someone of who for all we know could be a demon.
Cassandra: Yes the Chantry has us claim that demons are to always be turned away.
Solas: So why are you excusing Cole?
Cassandra: I am no fool Solas. I will be mindful, but the inquisitor trusts that he has good intentions and I do not think the Inquisition is in any position to turn away from help when it is offered. These are dire times. I will give him the benefit of the doubt until he shows any signs that he will be trouble.
Cole: Thanks Cassandra. I will try my best to do as much good as I can.
Solas: That is a commendable and rational way of thinking unlike some of these people that have joined our cause.
Cassandra: Do not remind me. A day hasn't gone by when Sera has not flirted with me and Vivienne or Dorian are telling me to find better clothes.
Solas: I agree it is as if they have nothing else to talk about. Shall we return to the task at hand then?
Cassandra: Yes I agree.