It's universally acknowledged that most anime fillers suck. In fact, some people hate them so much that they skip whole arcs of long series like Bleach, One Piece, and Naruto. While there's plenty skippable filler out there, people who avoid it entirely might be missing out on some good anime filler.
Yes, it might seem unbelievable, but there's actually some genuinely good anime filler arcs and good anime filler episodes out there. While some studios are just filling time until the next chapter of the manga drops, others use the opportunity to further develop characters, fill plot holes, or just have fun. Vote up the filler episodes you love, and if you skipped some of the episodes on the list, go back and watch them – you'll be glad you did.
My Hero Academia has only one filler episode, and some would argue that it's the best episode in the whole series. Everyone's Internships fills audiences in on what was going on with the rest of the UA students while Midoriya, Todoroki, and Iida were facing Stain.
This is great, not only because it's something that viewers are legitimately curious about, but because it focuses on everyone's favorite frog, Tsuyu Asui, and her adventures at sea. Also, you get to witness Best Jeanist forcing Bakugo to straighten his hair. Who doesn't want to see that?
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Cowboy Bebop has more filler than one might expect from a 26-episode anime but said filler is actually pretty enjoyable. One of the best episodes is Toys In The Attic. In this episode, the Bebop crew is being terrorized by an unknown "creature" that turns out to be have been attracted by a fridge full of moldy food.
The actual fear viewers feel for the crew's safety provides a great contrast with the moment that they hurl the fridge out of the space station. The part where Ed eats the creature that everyone was so worried about also makes for a perfect ending.
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Surprising as it may sound, the last few episodes of the first season of Noragami are, in fact, filler. That's totally okay, though, because it fits seamlessly into the rest of the show, and it actually helped explore some concepts that were otherwise only alluded to.
Rabō, a god of calamity who used to work with Yato, shows up to try and convince Yato to give into his own calamitous nature. The drama is high and we get to see Yato's convictions be truly tested. It might be filler, but it's an excellent end to the first season.
Samurai Champloo isn't based on a manga, so filler here doesn't mean that isn't anime original, it means that it has nothing to do with the main storyline. Baseball Blues is one of those episodes. While some viewers might be frustrated by the way it interrupts the narrative, others love this episode. Why? Because the anachronisms are hilarious.
Baseball was invented in 1839, while Samurai Champloo takes place during the Edo period. While there's a little bit of overlap, it's unlikely that baseball would even have existed in that period. In fact, there are so many anachronisms in the episode, you could probably make a great drinking game out of it. Also, it's just great seeing Mugen and company do something other than sword fighting.