Luner:]

Large, fur-covered ears, a third eye, white hair with colored edges. Her eyelashes are white, pink, and gold, so we can assume that some of these colors are from makeup, but her sclera are still white.

(Model ripped by WhiteMageSunny on DeviantArt)

Like Rauru, she has those weirdly proportioned hips and torso. No horns, though, so that could be a male Zonai thing, or just a him thing.

Bonus evidence, in lack of sample size, the dragons:

The three elemental dragons all have the same kind of hair as Rauru and Mineru, fluffy with spiked ends that have colored edges. And we know, from experience, that dragons keep the hair of their previous forms as their mane:

Now for our little scamp.

First off, his skin is gray-green. Not an indicator of itself, could just be a different fur color.

However, he also has:

Red, silky hair with no secondary color

Black sclera

No lashes

No horns

No third eye

Pointed ears on the sides of his head

We've established that the horns aren't a requirement, so that's also not a direct indicator. Maybe he's missing the third eye because that's a royalty-is-different trope. Maybe the red hair means he's half-Gerudo, and the ears are a byproduct of that. The black sclera is weird, but not entirely unforgivable. Zelda's done weirder (see Yeta and Yeto, or King Zora and Ruto).

(Model ripped by WhiteMageSunny on DeviantArt)

And now we get to the proportions. There's no strangely cinched waist like Mineru and Rauru have. The legs are proportional to the torso in a way that's almost human.

Still could be half-Hylian or Gerudo, right?

Wrong. Look closer.

That is a TAIL.

Neither Mineru nor Rauru have tails. But there's something even more damning here.

Mineru. Five toes. Plantigrade (on the floor) feet. Big toe to little toe, like a human.

Rauru. Five toes. Plantigrade feet. Big toe to little toe.

Hero's Aspect! Four toes! Two large middle toes! Cat toes!

Digitigrade (catlike, heel raised) feet! That spoke on the end of the sandal never touches the ground!

Where did the tail come from? The black sclera? The change in skeletal structure? The literal paws for feet?