If I remember correctly that just meant he couldn't form official parties and such (like in RPG games).
When, at the beginning of the manga, he accidentally mind controlled those 4 gyarus they became his companions as servants or slaves/familiars or something so that works just fine, he just...
From the point the new girl showed up and until she left Rimu was only shown once. Considering that she can tell a lot of stuff with her skill she might already know what's going on and prepare accordingly.
Two Magical "Girls" having a magical fistfight in the middle of the city, supporters nowhere to be seen.
Haruto really just told MagicGPT to "make an event" and left it with full authority...
The biological explanation is that women have magic while men don't.
As for the lower part, being treated as anything between second class and slave would put quite severe stress on anyone that isn't a massive masochist. And that stress would generally get in the way of sexy time.
19 is technically also a "teen" but old enough to run shady businesses. Not that shady businesses would care much for legality in the first place, being shady businesses and all...
This was a bit stupid at times but throwing away your humanoid form to become some sort of guardian god to you husbands nation, that's a story I'd read. So many interesting options how that could play out.
I'd give him the benefit of the doubt and assume he meant a 'familiar' teacup but when told he should have magic he starts flailing his arms around and claims 'no good' because nothing happens. His head is EMPTY. So might as well be thinking exactly that.
When designing a unit for a game you design it once and then copy+paste it however many times you need said unit in the game whereas in manga you need to draw every new appearance, every new pose, every movement etc.
If you're trying to earn your daily money through manga you don't have endless...
That's pretty much the same reasoning I had.
At this point the little girl still thinks of the dark elf as an evil being so she's looking for some safety for her friends like "even if I lose, I want my friends to be safe and free."