G8 – One Piece
The G8 arc of One Piece is one of the most creative pieces of filler ever created in anime, proving that original content isn’t always a bad thing.
In this 11 episode arc, the Straw Hats showed off a lot of personality that had yet to be explored so far in the show. This story has Nami displaying her mind for strategy, Sanji showing off his cooking skills, and Luffy facing off against an interesting and unique antagonist in Captain Jonathan.
More than anything, G8 fits in seamlessly between the Skypiea and Long Ring Long Land arcs to the point where people often don’t even realize what they’ve watched is filler. In a show that is as long as One Piece, it is nice to have more casual arcs like this that still manage to be exciting while also fitting in with the dynamic of the series.