If you liked
Saiki Kusuo no Ψ-nan
|
...then you might like
Xian Wang de Richang Shenghuo
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Both have a extremely overpowered protagonist who doesn't want their abilities to be shown. Both animes also have a if not partial school setting. I'd say the only thing to note is Xian Wang de Richang Senghou/The Daily Life of The Immortal King is a Chinese anime while Saiki Kusuo no Psi-nan/The Disastrous Life of Saiki K is Japanese.
If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
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While I personally enjoyed death note a lot more then Code Geass, I'd say the two protagonists both are very similar in the sense they both go too far for what they believe not caring about the illegal aspect relative to killing people off. In that aspect Light and Lelouch are the same.
If you liked
Hunter x Hunter (2011)
|
...then you might like
Kami no Tou
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Think of the Heavens Arena arc, but if it was a whole anime. The main character Baam and his closest friend Khun will resemble Gon and Killuas relationship. Anyways solid 8.5/10 in my opinion.