 If you liked
Overlord
|
 ...then you might like
Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru
|
Both of these shows involve an MC who is not a prototypical good guy. The difference is that why Assassin shows an MC who is trying to be more of a person with their own thoughts and opinions, Overlord dives into an MC who all but removes their humanity from the start and goes full villain. Why both shows take different paths, their goals are somewhat similar and may make the watch at least worth a try.
Also both MCs are OP so that can scratch the power fantasy if that is what you are looking for.
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Recommended by SaintJames012