If you liked
Death Note
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...then you might like
Code Geass: Hangyaku no Lelouch
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Must be a really common comparison since the MCs of both the series share many similarities. Both Light and Lelouch want to change the world according to their own ideals after gaining access to some sort of powers. Both of them are goated characters in terms of IQ and they have created a separate tier of own. Their ideologies and actions ultimately lead to act them more like villains (or anti-hero rather?) than heroes. Describing Lelouch by saying "Light with a shred of emotions" wouldn't be too wrong.
If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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...then you might like
Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e
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Socially awkward protagonists who start with being loners in their classroom at the beginning. Both the MCs might have poor social skills but possess high iq in terms of tactical analysis. The similarities ofc don't end here, both the main girls of the respective shows are "ice queens" who treat others like of little significance. Just like the MCs, both the girls have trouble in interacting socially and yet give excuses to not admit it wholeheartedly. Similarities exist among the side characters as well, including the highly active girl in all kinds of social circles, the main girl's respective older siblings who are regarded superior to them within their families, a cool teacher with some sort of unique connection with the MC (though the connections are entirely different), the popular kid of the class shown as the exaxt opposite of the MCs.