In an interesting twist while looking at references on porcupines. I came across a cool-looking one and ended up with Luna.

Luna is based on the prehensile-tailed species of porcupines.
So she has that bigger nose than Sol does as well as a much longer tail.
While the species are more covered in quills, I made this simpler version for her instead
The colors are even lighter to try and match the species as well.
Her claws are slightly curved more as well.
She also appears a bit more laid back and has tired-looking eyes

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Fun Fact:
Both she and Sol are the 3rd set of duo characters that started out as one.
The names of all the duos have something in common.