So, this was born as a writing exercise when I came back to writing after a long hiatus, it has 6 chapters complete and another 2 that just need a little work, and I'm planning on continuing it, but at a slow pace.
I'll probably post 5 chapters in 2 days, then a new chapter per week... or maybe even 2 weeks, don't expect fast releases, sorry about that.
Also, one of my characters is from Knight Run, a manhwa that's pretty old and VERY underapreciated here in the west, it's pretty fucking great, both the story and the fighting scenes.
It's a space opera where humanity is at war against a biological race of hive-like creatures, they're governed by queens, and the most powerful have a protection field which blocks projectiles; this field can only be pierced by an extremely valuable metal.
To combat them, humanity train superhuman knights and arms them with swords made from that weapon.
So, Knights are needed to fight powerful Aliens, but troops are needed to eliminate the minions, or the knight is exhausted by numbers.
It's also not only fights, but makes you think a lot.
However, Knight Run has somewhat bad art at the start, and the way the story is told makes heavy use of flashbacks, which can annoy some people, and I think it's the reason it's so unknown.
So, give it a try, search online and read a few chapters, it may not be for everyone, but it's still a GREAT story and, if you can't enjoy it, well, it's a pity but, as I said, it's not for everyone.
Anyway, here comes spoilers for the source of the fanfics.
Harem members are all over 18.
Jinx (Arcane Season 2)
She's in her own setting, so there's not much need to explain, she's basically the same from canon until she meets the MC.
.
Maelle/Alicia (Expedition 33)
She won against Verso and lived the rest of her life in the canvas, dying from being inside for too long, she's older than all the others but outside the canvas, probably the weakest, even if she's also the most skilled fighter.
.
Taylor (Parahumans/Worm)
At the end of the novel, she died, havign given her all to save humanity, she's kept all her powers and now they're fully under her control, her insect control is better than ever and she can control humans in a few meters around her, she can also turn this power off.
.
Pyrrha (RWBY)
In it, beacon starts at 18, so that's her age. Otherwise, she died like in canon, getting shot through the chest with a flaming arrow, she too retains all her powers and her body is at it's peak.
.
Fear (Knight Run)
Escaped, but gave her life to revive a powerful figure, losing her core and being reincarnated, she's the first one to wake up and, being non-human, decided to ditch the MC for the moment, but she's still around.