If you liked
Hunter x Hunter (2011)
|
...then you might like
Kami no Tou
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The premise of the Tower of God is very reminiscent of Hunter x Hunter's Hunter Exam arc, and both have really great worldbuilding. In addition to these things, many of the characters are very similar to each other. For example, both Gon and Bam are cheerful protagonists facing their challenges in the hopes of finding someone important to them, and Killua and Khun both come from prominent families that they are looking to be free from. The supportive dynamic between Khun and Bam is similar to the dynamic between Gon and Killua. The two series also use similar concepts at some points, some examples being the motivations of Kurapika and Hoh, the occasional banter between examiners, and the power systems that are introduced later on.
If you liked
Naruto
|
...then you might like
Hunter x Hunter (2011)
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Both are adventure anime with similar themes explored throughout. Both have an exam arc, and characters such as Hisoka/Orochimaru and Kurapika/Sasuke are very similar. Hunter x Hunter is my personal favorite anime, and if you really enjoy Naruto you should give it a try, plus there are only 2 filler recap episodes and that's it.
If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
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The protagonists have very similar viewpoints and personalities, and it's entertaining to watch as their well thought out strategies play out. Both also move into darker themes as the protagonist becomes more desperate later on. Also L and Light have a similar rivalry to Lelouch and Suzaku.
If you liked
Shinseiki Evangelion
|
...then you might like
Darling in the FranXX
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-mecha fights -some relationships between pilots