I may be nitpicking here, but bear with me a moment, please.
If we had a reverse-Cole, i.e. a mortal thrown into the Fade as a unique human-spirit hybrid and forced to cope with that alien world and its alien rules, would we refer to that human as "childlike" if they have a hard time handling all this and will never understand many aspects of the Fade like a true, native spirit does? Or would we say well, what do you expect, the Fade is seriously weird sh*t and I'm doing my best so get off my back and stop infantilizing me? We are humans, so we generally consider our perspective to be true and the norm and superior, while being different -- as Cole is -- gets slapped with an inferiority label (which childlike is IMO when it means cluelessness and ignorance), and that bugs me a bit. So I prefer "alien" to describe what Cole is: not inferior, but different and out of his element. Not to pick a fight, just to clarify.
(Also, some of the fandom really go for the "childlike" view of Cole to the point that it's almost squicky, so I'm admittedly a wee bit ansty about that term.)
Here here, well said!
In fact, you could say that our protagonists tend to be the Reverse-Cole's because whenever we are in the Fade, even the Mages tend to be like "What the hell is going on?" and they are the ones who deal with the Fade on a fairly regular basis?!
We see a lot of codex entries in-game where various Circle mages discuss and debate how the Fade works and how they over-simplify it (like the Veil works), as well as see the views of apostates (the Dalish and Solas), as well as Spirits who all seem to see it differently from each other, suggesting that in reality, how the Fade works is pretty much incomprehensible to everyone and doesn't follow any rules at all? Or that since "Imagination = Reality" in the Fade, then one's own preconceived ideas on how the Fade works are how it operates for that person, but not another?
But I'm going a little off-topic...
As for Cole and his relationship with others, I enjoy his banter with Varric the most, because while Solas understands him the most in terms of what he is as a spirit, Varric really seems to take him under his wing and actually want to get to know him as a person.
Cole's personal quest is actually enjoyable because we see both of them really care for Cole, yet disagree on what path he takes based on how they see him? Solas sees him as a Spirit of Compassion who is not fulfilling his purpose how it was intended, while Varric sees him as a Person who constantly wants to help others, but doesn't know how to help himself and needs support?
(Incidentally, I chose the "Human" path, because I think that with everything that's happened to him thus-far, Cole's already become far too different from what he was before and should explore it further)