Since debuting in 1997, One Piece has become one of the most recognizable media franchises in the world. The series is the best-selling manga of all time, and as indicated by the massive wave of hype surrounding the release of its live-action adaptation, Monkey D. Luffy and his crew show no signs of slowing down.
Source:https://www.cbr.com/one-piece-characters-who-deserve-a-spin-off/