I don't really know anything about Precure, so please fix any tagging errors.
It bugs me a tiny bit how the Precure characters aren't quite in the PuyoPuyo drawing style, particularly in the eyes. I think some of the other collaboration character sets (like the Cardcaptor Sakura, Sailor Moon, Neon Genesis Evangelion, etc. ones) were a little closer to the Puyo style. It's a bit more obvious when they are shown side by side like this.