Sanjuan Wolf

San Juan Wolf is a colossal giant who is a member of the Blackbeard Pirates. Known as "Colossal Battleship" for his size, he was originally one of the legendary criminals who was given a life sentence in Level 6 of Impel Down, where their crimes were so atrocious they were effectively erased from history itself. He was initially mentioned briefly by Emporio Ivankov.

Appearance
San Juan is an unbelievably-enormous giant, much bigger than Oars or Oars Jr., with a head the shape of an Onigiri. In fact, he is so big that he is roughly the same size as Marine Headquarters in Marineford and is thus the biggest known giant to date. While his entire body is not seen, theoretically a normal giant would fit in the palm of his hand. So where Oars would be a Large Giant to a Giant, San Juan is a Giant Giant to a Giant. How he was able to fit inside Impel Down remains a mystery (as well as brought out), as he is practically the size of the building.

Personality
Despite being known for committing crimes that caused his existence to be erased from history, he seems to have a playful attitude, as seen when commenting that he was found when he was trying to hide behind Marine Headquarters at Marineford.

Past
San Juan Wolf was once one of the most feared criminals in the world, but was eventually caught by the World Government and sentenced to life in Impel Down, Level 6, where he was effectively erased from history.

Impel Down Arc
Wolf was mentioned briefly by Emporio Ivankov as part of an explanation of Level 6's true horror to Mr. 2 Bon Kurei. Later, he was broken out of his prison cell by the Blackbeard Pirates and was recruited into the crew.

Marineford Arc
He was seen alongside the Blackbeard Pirates and fellow criminals, all of whom have been recruited into the crew, at Marineford to watch Whitebeard die.

Trivia

 * His surname San Juan may be referenced to San Juan Bautista, Puerto Rico's original name. Also, it could be referenced to the town of old San Juan in Puerto Rico, since it was a coastal stronghold filled with many ramparts to defend the island from pirates and rogue sailors, which may explain why his size is equal to one of Marineford's main buildings.
 * He is currently the largest giant seen throughout One Piece.