My only complaint, and it's really such a minor thing, is that Kanie and Sento's (maybe even Latifa too) designs were boring. They join the ever increasing list of characters who, if you just took a shot of their head, would be quite literally indistinguishable from each other. Kanie obviously moreso than Sento (thanks to her bow), but, visually, she's not that memorable either. Again, not that big of a deal, but I wish they had a bit more...oomph.
What you are referring to is widely known as the KyoAni Syndrome, a condition by which most anime characters in Kyoto Animation adaptation projects suffer from. There is currently no cure for this deadly disease.