Your portrayal of the universal elven character is sound. Also, the mentioning of his former slavery places a strong foothold for a twist in his character. Furthermore, the physical description leaves nothing to be wanted.
However, he seems to have an unusual amount of pros to his makeup. As noted in the two quotes below, he seems to be lacking in nothing a hero is wanted of. The problem with this is that it leaves no room for a flaw that will make him a truly workable character. He will overcome all his obstacles, and he will have no endearment.
I think that such a flaw could be developed in his memories as a slave. This memory has the makings of the origin for a burning hatred of the human race, which would be a major factor in his decisions. His hatred spawns pride. Pride goeth before the fall. Not that he will fall, unless you so wish it. Think about it?
And where and why did he learn swordplay? One would think he had little need for a blade...it would not be unwise to annex this detail.
"After all, he was strong in endurance and... everything...gifted and successful, even for an elf...elves were naturally extraordinary in intelligence, strength, and beauty...Arathen was even better...young, too."
"...overly handsome...also an excellent fighter and extremely quick-minded...most likely the best archer in the area..."