One Piece is one of the longest mainline anime running today, having aired 1166 episodes and counting. Its primary characters have grown tremendously in that time, with its audience feeling that even more. Children have grown up watching the series, introducing family, friends, and even children of their own to the adventures of Monkey D. Luffy and the Straw Hats. But, much like many popular, long-running anime released in 1999 or its surrounding years, One Piece had to produce non-canon filler episodes or pad its content to give its creator, Eiichiro Oda, space to stay ahead on the manga. The surprising bit is, One Piece is hardly the worst offender.
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