One of the Royal Seven Warlords of the Sea, fabled to be the best swordsman in the world. Travels the world on his small Coffin Boat with the all-powerful black blade "Night" on his back. Shanks was his rival until he lost his left arm.
This character, or any other variation of Mihawk, is needed to complete a mission on Missions: Baratie.
Also known as Raidhawk
The first raid (clash) boss.
And he still rocks. Good stats, very good captain ability, and awesome special. Yeah, he is crippled by a single socket, but he still sees a lot of play both as a captain, and as a sub.
How to socket him? The usual dilemma: Anti-Bind, Anti-Despair, Charge Special, Matching Orbs and Auto-Heal are all good (and don't you dare put anything else on him!). Auto-Heal helps in Forests of Training. Everything is fine, and frankly, advanced and dedicated players have been known to fully max 2+ Mihawks, for different sockets, since ideally you would want all five :D Which one to start with, no, there is no good answer. Choose your favorite.
Since new players are not familiar with mechanics: a health cut counts the enemy's current life, so you should usually use it on the first round against a boss, before you attack, to maximize the amount of damage done.