Canon

Canon: Whenever an author writes a series, everything he or she wrote themselves is considered canon. To put it more simply, canon is the original material that was stated by the writer in their work.

Manga
To know the story of One Piece and its content, you must look towards the Japanese print of the manga; where the series started from. The manga is the backbone of the One Piece materials, without it, One Piece wouldn't exist. Everything, everyone, any events or information is found in the manga is canon.


 * An example - In the manga, Ace met with Luffy and his crews briefly in Alabasta. After this Ace destroyed the Billion's ship and left. In the anime, Ace stayed on with the Straw Hats until just before they arrived at Yuba.

Fanon
If an unofficial source, say a fan of One Piece, decides to write a story based on Eiichiro Oda's work, then it's Fanfiction.


 * An example -In the manga; Vivi was the princess of Alabasta, that's canon because that is how the writer stated it. If you say that Vivi was a Martian queen, that's considered fanfiction because Eiichiro Oda did not write Vivi to be a Martian queen.

Novels
Two novels were written depicting various stories connected or separate from actual canon as depicted by Oda. The first novel is an expanded version of the Logue Town arc written by Tatsuya Hamazaki with ideas and concepts by Oda. One of the concepts used in the novel was a sequence left out of the manga explaining how Usopp received his goggles and his encounter with Daddy Masterson, which could be considered continuity or filler dependent on your views.

Cross Epoch
This crossover comic that featured the Dragon Ball cast and One Piece cast does not have anything to do with the main storyline, fans don't consider this a canon.

Omake Features
Most of the comics Oda drew in the omake have nothing to do with the canon, despite the fact that Oda drew them. The comics often humorously featured the One Piece cast in different roles and different situations which are standalone stories. However, the only possible omake which possibly could occur in continuity is Report Time, which supposedly chronicles the Strawhat crew's eating habits during the first parts of their voyage.

Movies
Movies 1-9 were supposed to take place during the series but they have few, if any, connections to the main storyline. Rather, these movies were based on the events of the series.


 * Movie 1 takes place in the East Blue.


 * Movie 3 has Tony Tony Chopper in it, but can not occur in canon since neither Nefertari Vivi (who was there when he joined) nor Nico Robin (who joined the crew immediately after leaving Alabasta and Vivi) are in this.


 * Movie 6 was based on Davy Back Fight, only that the setting is darker, and the events bigger.


 * Movie 7 was supposed to take place before Water 7. Although there are machines in the movie, Oda later added Machine Island to the canon storyline, although the only mechanics on this island were the Spaceys created by Moonwatcher.


 * Movie 9 takes place in Drum, but Vivi is not in it, Robin and Franky make an appearance, and Wapol has an older brother and new subordinates. It is dramatically different from the canon events that occured at Drum.

Why Canon?
One Piece Encyclopedia editors must always write down information that was written in the manga only. This is to avoid confusion and to help readers know the full pure story of One Piece. For example, most Dragon Ball fansite always have information that is mostly from the anime, many people would be confused on which is filler and which is not, once they read the manga they may not be sure if the anime started first or the manga. We do not want that here, we want to make a clear information on the One Piece story. For example you can't say that Chopper ate 3 pills in Davy Back Fight filler or Zoro cutting steel in the Warship filler because it was not found in the manga and the anime intend to fill the story.

For example you ask Toei what happens if Chopper ate 3 Rumble Balls, Toei would say, "he'll be fine" but Oda would say "he can't eat 3 Rumble Balls in within 6 hours or he'll be a monster." See, Toei would attempt to answer questions but they cannot be trusted because they are not the one telling the story. Which is why we must follow what's in the manga because Oda is the one who wrote the series, he is the one who make up rules and he's the one who drew the series.

If you create a page that is from the filler arc, one must put in the Category:Non-Canon. When a canon character has a filler alternation, one have to list them in the Anime/Manga differance section. Any rules or story made by Toei is not allowed to go in the canon information mainstream. This may sound harsh, however this is to help people understand why we must seperate filler from canon.