I think the problem is that they're all freakin' tropes with nothing more added; dense boi is the self-insert protagonist with the relatable personality of having none so you can project yourself on him easily, loner girl is the shy girl that secretly love the main character, glasses girl is the mysterious woman from the past, his little sister is the ''I am so good at housekeeping, I am such a good wife, wow !'' with an added incest subtext as a joke, and the assertive childhood friend is the unattainable flower beyond his reach.

All of them (except the main girl), by virtue of being side character he can talk to, have been somewhat expanded upon, may it be their reasons for loving him, or simply a glimpse into their personalities, but the childhood friend has constantly been placed in the background ever since the author added more characters to the mix, hence why the only thing we really know about her is ''I want to be an actress !'' because she says it now in every chapter since that detail was added (which hasn't been so long story-wise, but for us felt like forever 'cause of the wait between chapters).

Personally I prefer her over the others, mostly because none of the others (once again, personally) interest me in this story's context (they could find someone SO MUCH better than him) and I think they dilute the original story, but I could see each of them in a better mango, where they'd get the true spotlight, the detailed characterization and love they deserve.