Shueisha originally applied for the trademarks of six designs from the Demon Slayer series, including the aforementioned Tanjiro, Nezuko, and Zenitsu, as well as Tomioka, Shinobu, and Rengoku.
The saga over the Demon Slayer: Kimetsu no Yaiba trademarks continue with Shueisha losing their appeal for the trademarks of Tanjiro, Nezuko, and Zenitsu’s iconic patterns after the Japan Patent Office refused to grant the trademarks due to not finding any “part of its composition[s] … to be distinctive enough to be identifiable on its own merits” earlier this year.
He also runs a YouTube channel about Japan stuff called TheDoctorDazza, tweets at @DoctorDazza, and posts photos of his travels on Instagram.