Mushoku Tensei: Isekai Ittara Honki Dasu, Genjitsu Shugi Yuusha no Oukoku Saikenki Recommendations
The only 2 Isekai Fantasy novels I've come across, whereby the MC and his Harem form a believable family unit. No pointless meanderings & misunderstandings.
-Mushoku Tensei- is more Action Adventure, with an MC able to hold his own and with the best illustrations of its genre.
-How a Realist Hero Rebuilt the Kingdom- is more about Kingdom Building, with an MC more focused on the pen than the sword.