Onigumo

Vice-Admiral Onigumo (オニグモ中将, Onigumo Chūjō) was one of the five vice-admirals leading the Buster Call on Enies Lobby.

Personality
"With a moment of hesitation, how can you protect the future, from a criminal who is trying to escape? Fire!".

When a soldier argued against this order, being a firm believer in Absolute Justice, Onigumo shot him in cold blood, saying:

Abilities and Powers
As a Marine Vice-Admiral, Onigumo is capable of commanding a Buster Call alongside four other Vice-Admirals.

Devil Fruit
Onigumo apparently some sort of Devil Fruit that allows him to grow three pairs of spider-like arms from his back. With these spider arms and his own two human arms, he is capable of wielding a total of eight swords.

History
He was the one who commanded three ships to attack a fellow Buster Call ship with all its 1000 fellow sailors on board just to target Monkey D. Luffy, who was fighting on it with Rob Lucci, though he had confidence that Lucci would survive.

He was last seen shouting insults at the personnel of the Gate of Justice for closing it down (though in reality it was closed up by Sanji).

He's later seen again during the Impel Down arc awaiting to transfer Ace to Marineford and telling his squad not to let their guard down for a second during the procedure, and then telling Ace to take a look at his final sky.

Trivia

 * Onigumo (鬼蜘蛛) can be translated as "demon spider".