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

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

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).

Onigumo is one of the larger humans of One Piece; he is about twice as tall as a normal person.

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".