If you want:
Julin originally was a D&D character. For third edition, he'd be a human wizard, packing a 2-handed sword, possibly bastard sword as not many people use it, and in 3E the exotic weapons proficiency leads to his air of mystey. His history (2nd edition rules):
Third son of Mediterranean-area like family. First son is crown prince, second son is head of army. With no duty to fulfill, he trained as a fighter in an attempt to become an elite general, wielding a 2 handed sword. During a battle with a troll, his neck was cut deeply, about an inch from cleanly severing his head off. The troll left, and an apprentace mage arrived on the scene. In order to prevent his death, he used a mending spell to reattach Julin's neck. While this did save Julin's life, it left an irremovable scar on his neck, and his voice is very raspy due to the vocal cord damage. With that defeat, he never would be able to command an army, so he became an ambassador, and started studying the arts of magery. Julin wears his family colors (purple), and is still a fan of the tunic/pants combination. He wears a vest covered with pockets instead of a robe, and a stiff, high-necked cloak in order to cover the scar. He still carries (and can use) his 2-handed sword, which he uses mostly for intimidation.
An outsider to the Neverwinter area, his strange looks, air of superiority (still a prince after all), and the scar on his neck all combine to give Julin a relatively low charisma score.