Generally, anime brands that are banned in various regions around the world are due to legal regulations or specific restrictions concerning their content that cannot be avoided.
Below are some examples:
Shingeki no Kyojin – Attack on Titan (China)
Shingeki no Kyojin (Attack on Titan) is one of the most popular anime series worldwide and has a large fanbase. However, it is the first anime (though certainly not the last) to be banned in China. The stated reason is that its content is deemed too violent for children. Consequently, the Chinese Ministry of Culture banned the work created by author Hajime Isayama in 2015, along with 30 other anime titles.

Midori: Shoujo Tsubaki – Midori: The Girl with the Camellias (Banned in Most Countries)
This anime is nearly universally banned worldwide due to its excessively dark content that horrifies viewers everywhere. Shojo Tsubaki tells the story of a 12-year-old girl living in a world filled with horrific events, including a demonic figure threatening her existence.
In fact, many copies of this anime have been burned or destroyed due to the traumatic impact it has on audiences immediately after viewing, as the film’s depiction is extremely graphic.

High School DxD (New Zealand)
High School DxD is an anime centered around the misadventures of Issei Hyodo – a teenager who dies and is reincarnated as a devil. New Zealand declared that this anime is not suitable for viewing, which is why the Office of Film and Literature Classification (OFLC) classified it as containing adult content.

Isekai Maou to Shoukan Shoujo no Dorei Majutsu (Australia)
Isekai Maou to Shoukan Shoujo no Dorei Majutsu is an isekai anime. The story revolves around a player who is transported into a fantasy game and must take on the role of a demon lord to survive in that world. The Australian Classification Board has outright refused to classify this anime, but has not provided any specific reasons for this decision.
This ruling means that the anime is officially banned in Australia. Many fans find it difficult to understand why this is the case, even though it doesn’t come as a complete surprise.

Crayon Shin-chan (Japan)
Crayon Shin-chan follows the adventures of a five-year-old boy named Shinnosuke “Shin” Nohara and his family, showcasing humorous situations in everyday life.
Although it is beloved by many countries, this anime was banned in Japan in October 2008 after protests from parents and the Ministry of Internal Affairs and Communications. The reason was due to many inappropriate images affecting children. The anime continued airing in March 2009, although it had been significantly edited, following the demand from many dedicated fans.

To be continued…