If you liked
Overlord
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...then you might like
Yasei no Last Boss ga Arawareta!: Kokuyoku no Haou
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You got an OP MC who in the case of this manga used to rule over the world. Both got isekayed to an MMO and search for their old companions while being entangled in the plots and the world itself. Both have to struggle with some mental conditions after being isekayed. While Overlord edges somewhere between lawful evil and neutral evil, this manga is closer to the true neutral side, meaning that MC is not that cold-blooded and malevolent in his goals. Still, quite surprisingly it gives off a lot of similar vibes. The setup and the world are much closer to the standard isekai, but I find the authors' approach to be similar in how they are prone to deconstruct and subvert some of the most prominent tropes in the genre. It's also quite good.