Total Recommendations: 2
If you liked
Overlord
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...then you might like
Tensei shitara Slime Datta Ken
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MC tries to build a nation from nothing and both are primarily made of monsters I would say that overlord has better humor and story but doesnt have nearly as good power system both are in core similar but one is on good side and the other on bad.
If you liked
Death Note
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...then you might like
Code Geass: Hangyaku no Lelouch
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Lelouch is in many ways similar to light and both them posseses power that can kill people and they used it to unleash political/mental war and you can see how the time useing such power affect their minds.