 If you liked
Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru
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 ...then you might like
Saikyou no Shienshoku "Wajutsushi" de Aru Ore wa Sekai Saikyou Clan wo Shitagaeru
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cold calculating and rather heartless protagonists with a goal to be the strongest
and collect powerful partners in the process
wajutsushi is not an isekai and rather aromantic
and the strongest assassin is harem isekai, the MC is also less murder happy
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Recommended by Chika_tetsu