...interesting. That's a lot more votes for yellow than I thought she'd get, (and gold for that matter), but I see it.
I actually was leaning a bit more towards white cure myself (or new category of multicoloured cure) for one main reason:
Certainly in the context of her team, she's the yellow cure, but in the context of all the precure?
Yellow cures tend to be Very Yellow. Like they're almost exclusively Yellow and orange, or Yellow and green. And when they are it's almost all over. Very yellow-heavy on coverage. In fact, the only ones that seem to have less yellow are the ones with team outfit designs eg: Honey and Lemonade (yes!5 ver), where there is a secondary team colour.
The entirety of her base layer is white. Her hair is yellow, blue, and blonde (sandy).
The skirt is bright yellow, sure. As the precure of the sun, the sea, and the shore, it makes sense, but she still has a lot of white in her for a yellow precure. In fact, without the skirt, (which holds its shape like a hooped skirt btw) she is almost entirely white.
If I did classify her as a yellow, she'd be the whitest-themed yellow precure out there.
But that's why I asked, because I knew it would be very borderline.
Here's a (slightly cheesed) version of her without her hair wave btw:
(in which you can see the two-tone thing going on in her actual hair a bit better)
And that floating white bit around her arms is her magical 'sail' and can get a lot bigger. She uses it as a key part of her physical attacks and magic too.
(rough) pov: You're just about to get punched in the face by a magical sack of canvas.
In an additional attempt to make a decision on this, there's one more thing to consider: What colour is her magic?
She's a nautical themed cure, the sun, the sea and the shore: so that's tides, and waves, and the interconnections between them all. A lot of her attacks are throwing her sail at them and it turning into a magical wave. (she also just throws her sail at them sometimes)
Magical sail: not called as a magical attack, but magically used instead of physical punching wherever possible. Also used for climbing, grappling etc.
Sunny shore: This attack doesn't actually do anything, but conjures up a sunny beach setting for a bit. Can calm the enemy down.
Glistening reflection: Briefly makes a reflective surface shine in a dazzling attack. Very situation dependent.
Precure rising tide! Big wave! (magical attack, usually a one-off as is high-energy)
Carving delight! (addition to previous where Connect surfs down the wave and the move manages to purify the monster or person in doing so.)
So magic= Yellow and blue. So another tick for the yellow cure box.
Serene still tries to sneak her into the White cures photo's though. Someone tries to drag Connect back but Serene's hand is just. welded to hers.
