I love the Arifureta web novel too; nice to see someone talk about it on Fuwanovel. I'm not caught up on all the after stories, though.
For those who shy away from pure novels, the Arifureta manga is also a very solid adaptation, popular on sites like MangaDex. https://mangadex.org/title/248525ed-ad1c-4ddc-a834-5d6ce66a3ad2/arifureta-shokugyou-de-sekai-saikyou Also, those who want to read this novel in English should make sure to read the official J-Novel translation, which are really good and reads so much better than the mediocre half-MTL'ed fan translations. https://j-novel.club/read/arifureta-from-commonplace-to-world-s-strongest-volume-1-part-1
I agree that the connections Hajime has with the heroines are one of the best parts of this novel. I always try to find good harems like this, but it's hard. Campione is another great example.
P.S. On the subject of web novels, Kumo desu ga and Yondome wa Iya na Shi Zokusei Majutsushi are two other top-tier ones with antihero protagonists, which are (relatively) lesser-known. And I assume you've heard of Re-Zero, Overlord, and Mushoku Tensei... those are three other deeply unique web novels (well, Overlord at least abandoned its web novel version) with nice prose and amazing worldbuilding.