If you liked
Kingdom
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...then you might like
Arslan Senki (TV)
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Very much like Arslan Senki, Kingdom has a prince become King and take control of a kingdom that is falling apart. Kingdom is set in ancient China before unification where as Arslan is set in middle east and Indian subcontinent. Kingdom has a fair amount of politics, but it is more focused in battle strategy and war. Also unlike Arslan Senki, the protagonist of Kingdom is a loyal friend of the king and his attempt to become the greatest war general that ever lived. Still the King character in kingdom is 2nd most important character and has episodes dedicated solely to him. There are a lot of similarities between the two shows.
If you liked
Hunter x Hunter (2011)
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...then you might like
Kiseijuu: Sei no Kakuritsu
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The Chimera Ant arc from HxH is somewhat similar to the plot of Kiseijuu. There are heavy moral dilemmas involved and you will slowly lose the sight of who are the good guys and who are bad.
If you liked
Gintama
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...then you might like
Durarara!!
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Very much like Ikebukuro in Durarara, Gintama takes place mostly within the confines of Edo (Tokyo). Both the cities have a bunch of odd ball characters that make regular appearances in various episodes and bring in their flavor of humor and drama. Gintama is more episodic, but the feel you get from both the anime is quite similar. Both series have yakuza wars as well.
If you liked
Slam Dunk
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...then you might like
Kyou kara Ore wa!!
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The main characters of Kyou Kara are very similar to the protagonist of Slam Dunk, who is also a delinquent with bad luck with ladies.