If you liked
Yondemasu yo, Azazel-san. (TV)
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...then you might like
Hoozuki no Reitetsu
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It has dark humor with extreme violence and pop culture in it. They both have a topic on demons but Hoozuki is focused on the Eastern side while Azazel-san is more on the Western side.
If you liked
Panty & Stocking with Garterbelt
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...then you might like
Cuticle Tantei Inaba
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Gag comedy in ridiculous levels. Slightly violent except Cuticle Tantei Inaba has less dirty jokes.
If you liked
Sanctuary
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...then you might like
Ouroboros: Keisatsu wo Sabaku wa Ware ni Ari
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Similar premise. Both have childhood friends who went to different fields in order to change society. One became a yakuza while the other worked for the government/authorities. The two friends are still in communication but they hide their relationship from public to avoid suspicion.
If you liked
Top Secret: The Revelation
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...then you might like
Psycho-Pass
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-Has a rookie cop who is trying to understand the system -Rookie cop works with a team of detectives who know how the system works -Police drama -Sci-fi elements -Psychological themes
If you liked
xxxHOLiC
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...then you might like
Tousei Gensou Hakubutsushi
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Both male protagonists help in a shop and deal with supernatural beings.
If you liked
Futatsu no Spica
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...then you might like
Uchuu Kyoudai
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Very similar themes: the main characters dreams in going to space and endures a lot of tests. They also experience a lot of problems while reaching their dreams.
If you liked
Witch Hunter Robin
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...then you might like
X-Men
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Both have individuals with special abilities working together as a team, set in the modern times. Both shows also deal with prejudice of those with special abilities.
If you liked
Witch Hunter Robin
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...then you might like
Senkou no Night Raid
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Both have individuals with psychic abilities working for a secret organization and uncovering conspiracies. Also, both shows are filled with an atmosphere of mystery and sometime, betrayal.
If you liked
Rurouni Kenshin: Meiji Kenkaku Romantan
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...then you might like
Bakumatsu Kikansetsu Irohanihoheto
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Both involves the Tokugama shogunate (Bakumatsu Kikansetsu Irohahoheto is set on the final years of the Tokugawa Era while Rurouni Kenshin is set during the beginning stages of the Meiji Era). Both have wandering samurais as protagonists who later settle down with some companion. Both of them have female love interests who are also skilled in swordsmanship. And both animes have real life historical figures (Hajime Saito for RK, Hijikata Toshizo and Okita Souji for BKI who are all part of the Shinsengumi) which the protagonists are acquainted to.
If you liked
The Big O
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...then you might like
Yuugo: Koushounin
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Roger Smith and Yugo are negotiators who don't kill people and use weapons. Except that Big O is set in a fictional noir city while Yugo is set in Pakistan and Russia.
If you liked
Shiki
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...then you might like
Blood-C
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Both are set in a remote village where monsters (or vampires) roam around by night. Both early episodes started out very slow until in the middle, things finally took off.
If you liked
Trinity Blood
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...then you might like
Blood+
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Both shows deal with vampires. Both shows have main characters who have siblings in the opposing faction. Both of them vow to defeat their siblings so that there would be no more harm. Both of them doubt about themselves until they eventually accept who they are.
If you liked
Gensoumaden Saiyuuki
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...then you might like
Tsubasa Chronicle
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Both features a group of four people traveling together search for something. Both groups have a cutesy mascot who helps them in their travels. Both groups also being watched by a good entity and the bad guys.
If you liked
Gensoumaden Saiyuuki
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...then you might like
Asobot Senki Gokuu
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Both are based from a old Chinese novel, Journey to the West. Both have groups of people traveling together to search for something. Both have 4 main characters closely based on the 4 main characters from the novel.
If you liked
Trinity Blood
|
...then you might like
Blood+
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Both shows deal with vampires. Both shows have main characters who have siblings in the opposing faction. Both of them vow to defeat their siblings so that there would be no more harm. Both of them doubt about themselves until they eventually accept who they are.
If you liked
Koukaku Kidoutai: Stand Alone Complex
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...then you might like
Senkou no Night Raid
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Both have political backgrounds which are heavily discussed. Both have secret government organizations with adult characters who have special set of skills and worked as a team. Both have awesome and jazzy music. Difference is that GITS sets in the alternate post-WIII while SnNR sets in pre-WWII.
If you liked
NieA Under 7
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...then you might like
Level E
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Both human protagonists are living with an alien. Both aliens tend to annoy the human at all times. The setting is quite similar as they are both set in a rural area. And also, both have aliens living among the human populace except that in NieA Under 7, everybody is aware of the extraterrestrial existence due to the antennae.
If you liked
The Big O
|
...then you might like
Kaiketsu Jouki Tanteidan
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Both series have mechs except that Big O is bigger. Both main characters have butlers and female assistants. Both have a noir atmosphere.
If you liked
Seikimatsu Occult Gakuin
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...then you might like
Otome Youkai Zakuro
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Similar to this anime, the male lead is a wuss while the female lead is a tsundere and knows how to deal with spirits.