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Here is the definitive list of Black Clover filler episodes.

Is it essential? No. But if you love the Black Bulls as a family, these 7 episodes feel like a bonus OVA. Consider them “optional dessert.”

However, the anime is also well-known for "canon expansion." This means the animators often stretch a single manga chapter into a full episode by adding extra dialogue, reaction shots, or extended training sequences. While these aren't strictly "filler" (since they happen during canon story arcs), many viewers find them skippable if they are in a rush.