People would put Shingeki in that category considering the childhood friends relationship Eren and Mikasa and Armin have, as well as Ymir and Christa, Marco and Reiner as well as the inspiring uplifting message of determination against the odds in the series, its actually similar to KnY with that sense that uplifts you/makes you feel good with how the anime frames/presents the story. The series leaves you with a wholesome feeling.
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You can frame Death Note in the wholesome fluffy frame, consider Light and L [non-shipping here], L really finding a friend and having that sort of thing that he's missed all his life with Light. L and his butler, Light and his dad. Light and his sister. The Police Force as well.
Im unsure of Death Note's sales/circulation (final) unfortunately.
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Your BLack Clover point was fair. It did take a bit of time for the chemistry between characters to get going as Asta and Yuno were both outsiders. But once they got established in their units, I'd say it is one of the most wholesome and fluffy series in the magazine.