Here are the filler episodes in Black Clover:
In conclusion, Black Clover redefines the modern approach to anime filler. By prioritizing author-supervised light novel adaptations and expanding upon existing canonical events, the series avoids the stigma often attached to non-manga content. While it occasionally succumbs to the necessity of blatant stalling episodes, the vast majority of its original content feels essential to the viewing experience. Black Clover demonstrates that filler need not be a dirty word; when handled with care and respect for the source material, it can serve as a vital expansion of the world, enhancing the overall narrative rather than detracting from it.
Here’s a concise review of (based on the 2017–2021 anime).
29, 66, 68, 82, 123–125, 131, 134–135. The "Devil Believers" Arc: 142–148.
Some episodes dive deeper into the lore of the Heart and Diamond Kingdoms.