I personally think that the thus far the admittedly spotty evidence of Adolin becoming a Radiant at all points to his possibly belonging to the order of Willshaper. A collection of uncut gems who I imagine can cover a wide range of personalities kind of a catch all of the Knight's Radiant. This theory is partly based on the name of a chapter he was the POV in (he does have quite a few Maxal calm down) in Words of Radiance. However, I at this point don't see him becoming a Radiant for some time if at all.I disagree with some that his murder of Sadeas will "break" him. The SOB had it coming and I doubt anyone (Adolin included) are going to shed a tear about that. Now the ripple effects (ie unintended consquences) of this act might precipitate some discomfort that could be severe (I think his widow is potentially more lethal and treacherous than he was ) or moderate but we will have to wait and see.
At this point to me Adolin seems like a somewhat decent (if a little predictable) bloke who is used to having everything without having to try very hard (women, victories what have you). As I'm sure many have already stated he seems written to embody all those traits of the arrogant rich, blonde haired blue-eyed football quarterback/Captain America trope but in this portrayal is actually not a complete cremhole but still has some serious growing to do. At this point he can still be petty just to be petty (Am I only the only one who got really irritated with the Bridgeboy comments?) and continues to be borderline racist at times in large part due to his privileged upbringing. Kaladin and Shallan's newfound status will change that irrevocably and we will see what becomes of him next.
Unfortunately for the shippers out there I find his attraction to Shallan mutually shallow at best. I believe her interest is akin to a school girl crush and that since she is still having a wretched time figuring HERSELF out not a very mature perspective at this time and his attraction to me is really only based on the fact that she is a novelty to him as she is not one of the many sycophants he encounters everyday, I think that instead of the oft-horrific love triangle people are so afraid of (odd since Brandon has already touched on a version of the "love triangle" in Mistborn and everyone loves that) we will see three people grow, mature, change and may continue romantically amongst themselves or all may go elsewhere with people we haven't even encountered yet. There are 8 more books people.