Writing up something now, but I have to go to the store.
I am thinking human, scores.. 14, 12, 13, 12, 9, 15.. Though are you allowing the human variant (one extra skill, one extra feat?) Because then I might drop a point from dex and add it to wisdom... though having a negative wisdom modifier might be interesting. I figure he was very young when he witnessed the fall of Lux and his subsequent selection of his role as the next lightbringer. I think he was an acolyte training to be a paladin or something when Lux fell and he somehow escaped, so I think he will feel personally indebted to her for this great honor bestowed upon him. As such, he will strive to 'prove' himself worthy of her faith in him, so he will not shirk from combat. After-all, in his mind, what good is a lightbringer if they don't actively champion Lux's cause?
So he spent quite a few years gathering up the party, and might be about 17 years old when the game starts. As a result, he has focused all his mental energies into this task and is a little naive about other things. Ie; he has trouble seeing things outside the frame of his 'mission', so he has low wisdom. I can't decide if I want it to be 9 or 10.. whether his wisdom is just 'average' compared to the other party members or whether he's even less wise than your standard commoner.
So yeah, he's a little immature. Perhaps too eager and brash to bring the fight to Tenebrax and his minions.
I am inclined to make him somewhat short, blonde, and handsome. Pretty to look at, but not very bright. Well, he'll have decent intelligence, but he's just naive. Suddenly I am reminded of this image...
If I had the time, I would draw the character myself, but I am perusing through others.. and this
seems like the best bet, but he looks much too severe. My character will likely not flinch from plunging himself headlong into combat... but is absolutely doe-eyed when it comes to worldly things. I am inclined to believe that in the years he spent gathering up the party, someone may have been taking care of the practical things for him while he was just the living symbol of Lux's persistence. Perhaps one of the PCs.
That being said, he should mature and develop over the course of the game.