I seem to be the only one who didn't like them.
They didn't really stick out to me either. I liked the the girl who could grow into a giant and her gf, Mamori and Mirei, and Kasumi and Hibiki, but it seems a lot of people saw fit to diminish or make fun of them for one reason or another, which they're entitled to do I suppose.
I, on the other hand liked them from the first seconds they appeared on screen lol. And this doesn't happen to me often.
Well, some ppl don't like Mamori and Mirei, because Mamori is just too dense and the classic all innocent- kinda boring girl. At least that's my main reason.
I've seen others also dislike her because it seemed like she liked Akira more than Mirei, and all that talk about looking for her prince etc. I dont care about that part, but imo her relationship with Mirei was just not very good developed until the end of the anime. Also it seemed like they were supposed to be together because they were the main characters, not because their dynamic was very natural.
Hibike only appeared on screen for like 4 minutes, so not enough screentime to get developed and be more likeable.
Charlotte is not my type, but I think she made a more interesting match with Kasumi.