Vice Admiral is the third highest rank in the Marines. These officers can have varying duties and amounts of authority. For example, one vice admiral, John Giant, is seen to have some special authority, as he was the first in the entire Marine Headquarters to receive the report of the Buster Call and could also evidently command other vice admirals to dispatch. There are always at least five vice admirals sent with a Buster Call fleet.
The general attire of a vice admiral is that of a Marine coat with epaulets and a suit and tie worn underneath. The only vice admiral to wear an attire different from others is, again, John Giant, who wears a gold and red uniform with a strain of medals on his chest, and later Smoker who keeps his current marine jacket, only adding to it the standard marine coat. While most vice admirals wear standard blue epaulets, Garp wears black and red, while Tsuru wears gold.
Vice admirals are well known for their strength, and it would seem that most of them are swordsmen and several have been shown using the Six Powers, most likely three for those gifted. Many Giants who are shown to be Marines are vice admirals, a testament of their immense strength. Another attribute that is common among vice admirals is that they all know and can use at least one type of Haki, though only Garp, Vergo and Smoker have been shown using it in obvious ways.