AppearanceAokiji is an incredibly tall person, easily towering over all of the Straw Hats (at the time of this meeting, Brook and Franky were not members of the crew). His standard outfit consists of a white button-up vest over a long-sleeved navy blue shirt and matching white pants and shoes. He also wears a yellow tie divided geometrically by black lines and a sleep mask on his forehead.
Twenty years ago during the Ohara Incident, Kuzan wore a bandanna with the Marine symbol on it, as well as a pair of sunglasses.
During his preparations for war against Whitebeard, Aokiji has a Marine coat draped over him like a cape, as with the other Admirals.
PersonalityAdmiral Aokiji is a sleepy, somewhat lazy fellow, evidenced by the "sleep mask" he constantly wears over his eyes. He has a lazy, relaxed attitude most of the time, be it in simple flirting or in deadly confrontation. He is so lazy that he can't even bring himself to work simple details like adding a crew's total bounty. He even states that he's an upholder of "lazy justice". As the result of his nature, he appears fearless, without a care in the world and sometimes even childish. This infuriates many and several question whether he really is an Admiral.
Aokiji is a loyal follower of the World Government and, even if he does as he pleases, always carries out his orders, within his own ideals of right and wrong (He let Nico Robin go which was in contrast to the Marines's final orders). Like many One Piece characters (e.g. Smoker, and Jaguar D. Saul), after witnessing the senseless killing of so many innocent people, it is possible Aokiji came to realize just how low the World Government's morals had sunk. His sense of justice, however, differs greatly from that of his fellow admiral, Akainu, whose belief in "absolute justice" contradicts Aokiji's morals.
Aokiji is also known to say "Arararara" sometimes in conjunction with his lazy attitude.
Aokiji's motto is "Justice by laziness".
MarinesAokiji also appears to have some connection to Garp, saying he once "owed a favor" to Garp.  It is currently unknown what the nature of this "favor" was, or what Luffy's grandfather did for Aokiji to gain this debt.
Aokiji also was good friends with Jaguar D. Saul. Apparently, one of the reasons that he let Robin go 20 years ago is because of Saul. He states that he felt it was his duty to watch over her life until she found her place.
Aokiji seems to have a bad impression upon his fellow Admiral Akainu, as Akainu (known as Vice Admiral Sakazuki at the time) followed the "Absolute Justice" and killed innocent Ohara civilians for insurance, causing Aokiji (while still as Kuzan at the time) to call him a fool.
Aokiji also seemed to know Smoker, since he mentioned Smoker and Smoker's message given to him about Luffy.
Abilities and PowersAs an Admiral, Aokiji is able to command vast number of Marine troops that are under his rank. Most of all, he has the ability to order a Buster Call attack on any island. His power is so great that he was able to easily overpower Luffy and the other Straw Hats single-handedly.
Aside from that and his Devil Fruit powers, his physical proficiency is also extremely high, as he is able to repel simultaneous attacks from Zoro, Luffy and Sanji without taking any damage.
Devil FruitAokiji has the powers of the Hie Hie no Mi, a Logia Devil Fruit that allows him to control, create and become ice. He can create enough ice to cover a Giant, a Sea King or several square miles of ocean within mere moments. He was even able to freeze the tsunamis created by Whitebeard, who is often hailed as the world's strongest Pirate. In battle, he uses his ice powers to disable and immobilize enemies, freezing their bodies solid just by touching them, and threatening to shatter their fragile forms. Like other Logia users, he is capable of breaking himself into his particular element to avoid most physical damage.
In addition, Aokiji is one of the few Devil Fruit users who has adapted their powers to travel efficiently across the sea. In his case, he simply rides his bicycle, the Ao Chari, across the sea, and the water freezes as the wheels pass over it. This freezing ability renders Aokiji one of the few Devil Fruit users who can counteract against the weakness of falling into a large body of water and drowning, as he can just freeze the water and stand on the ice.