Chapter 0

Chapter 0 is called "Strong World". It is a special chapter released with chapter 565. It introduces the events 20-23 years before the actual ones, and the story of Shiki for the 10th One Piece Movie: Strong World.

Quotes
I am not interested in "domination" Shiki! There is no need to be a pirate if you can't do what you want, right? No matter the pressure, I will never accept "Golden Lion"!!! -Roger, refusing to be Shiki's right hand man in order to dominate the world with him.

Weakest is a point of view... "East Blue" is the symbol of peace! -Garp, replying to Shiki who would not accept Roger to die in the "weakest sea".

Pirates

 * Jolly Roger Pirates
 * Gol D. Roger
 * Silvers Rayleigh
 * Crocus
 * Shanks
 * Buggy
 * Shiki Pirate Fleet
 * Shiki
 * Dr. Indigo
 * Giant Pirate Warrior Band
 * Oimo
 * Kashii
 * Dorey
 * Burogy
 * Cricket's Pirates
 * Montblanc Cricket
 * Kuja
 * Boa Hancock
 * Boa Sandersonia
 * Boa Marigold
 * Zeff's Pirates
 * Zeff
 * Rumbar Pirates
 * Brook
 * Whitebeard Pirates
 * Edward Newgate
 * Marco
 * Jozu
 * Vista
 * Marshall D. Teach
 * Others
 * Donquixote Doflamingo
 * Juracule Mihawk
 * Crocodile
 * Gekko Moria
 * Gaimon

Marines

 * Fleet Admiral Kong
 * Vice Admiral Monkey D. Garp
 * Admiral Sengoku
 * Kuzan
 * Tsuru
 * Sakazuki
 * Jaguar D. Saul
 * Bogart
 * Yamakaji
 * Momonga
 * Bellemere

World Government

 * Cipher Pol
 * Rob Lucci
 * Hattori
 * Jyabura
 * Blueno
 * Impel Down
 * Magellan
 * Hannyabal

Revolutionaries

 * Monkey D. Dragon

Others

 * Portgas D. Rouge
 * Nefertari Cobra
 * Nefertari Titi
 * Igaram
 * Tonjit
 * Duval
 * Woop Slap
 * Makino
 * Portgas D. Ace
 * Koshiro
 * Kuina's mother (Koshiro's wife)
 * Kuina
 * Yasopp
 * Merry
 * Dr. Kureha
 * Dr. Hiluluk
 * Dalton
 * Wapol's father, King of Drum
 * Nico Robin
 * Tom
 * Kokoro
 * Iceburg
 * Cutty Flam
 * Yokozuna
 * Hatchan
 * Shakuyaku

Trivia

 * Those who will see the film will have the volume 0 containing this chapter for free.