I'm not seeing anything to hate on in the character designs.

It's true Yugiri seems a literal copy-paste of the Miqo'te model/animation set with some changes to her head and a specific tail, however as we've seen, there are unique specific models for story-dependant NPC's, but they still have animation sets from the race set they are from. After all Alphinaud and Alisaie are also the same size, and they're shorter than playable Elezen. Also... there are kid Hyur NPC's, but no Miqo'te ones.