One Piece Omake

Omake (御負け, alternatively おまけ) is a Japanese term loosely meaning extra, popularly used by anime and manga fans to describe standalone bonus material such as concept art or DVD commentaries. Where One Piece is concerned, it most often refers to the non-canon gag strips that Eiichiro Oda produces outside the regular manga.

These come in two main formats:
 * Yonkoma strips, published in special issues of Shonen Jump (and, in one instance, the contemporary databook). These tend to commemorate holidays such as Christmas or New Year's.
 * Multi-page Strawhat Theater (麦わら劇場) strips, usually published in the series' log books. These tend to parody other genres such as science fiction or fairy tales.

It is common, though not universal, for both formats to depict the characters in a super-deformed art style.