Cancer

Cancer is a Marine vice admiral.

Appearance
Cancer is a man with slicked-back hair, sunglasses, and a cigar in his mouth. He has a scar running down his left eye. Cancer wears a white suit, with a marine coat.

Abilities and Powers
As a Marine vice admiral, Cancer is capable of commanding a Buster Call alongside other vice admirals. He also has authority over lower-ranking subordinates.

Haki
It was stated that all vice admirals possess Haki, so Cancer can also use the ability. However, he has not been shown using it.

East Blue Saga
Cancer was first seen sitting next to Vice Admiral Stainless at the meeting about Luffy's first bounty.

Jaya Arc
He attended the meeting held at Mariejois to discuss Crocodile's Shichibukai replacement. Doflamingo used his body manipulation ability to make Vice Admiral Mozambia and Vice Admiral Stainless fight each other. He wanted to stop Mozambia, but Doflamingo's manipulation was too strong.

Marineford Arc
Cancer is seen behind Vice Admiral Stainless and Vice Admiral Doberman, along with his fellow vice admirals lined up and ready to fight the Whitebeard Pirates. Later he was seen alongside Vice Admiral Tsuru, shocked when it was revealed that the Whitebeard Pirates had hidden another ship below the bay.

Anime and Manga Difference

 * In the anime, he didn't appeared next to Stainless in the meeting about Luffy's first Bounty, probably because he's been considered an unnamed and not important character.