If you liked
Gintama
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...then you might like
Holo no Graffiti
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Both shows use: -Pop-culture references for comedy -self-aware humor
If you liked
Maou no Ore ga Dorei Elf wo Yome ni Shitanda ga, Dou Medereba Ii?
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...then you might like
Spy x Family
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Similarity: Both of these story contain family oriented humor and interactions. The main characters are all gifted and overpowered in their world. Difference: is set in a fantasy world and occasionally have more serious arcs.
If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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...then you might like
Kaguya-sama wa Kokurasetai? Tensai-tachi no Renai Zunousen
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Both are romance stories set in a school. The dialogue between the love interest are funny and full of wit. Both stories develop their characters heavily and have similar character traits to each other. Kaguya and Yukino both act indifferent towards the main protagonist. The MC of Oregairu share similar characteristic to Ishigami.
If you liked
Monster
|
...then you might like
Bastard
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This may not be a manga, but I think anyone who enjoyed Monster would enjoy Bastard. The main antagonist in both series are serial killers with great charisma and a frightening personality, and the protagonist are both people who are "close" in away to the antagonist.