Hiddenite, the fusion of Turquoise and Petalite.
The two of them make an incredibly stable fusion because the two are each other’s “better halves”. However, Both prefer to remain separate because they enjoy each other’s physical company. Particularly, Turquoise enjoys doting over Petalite, though Petalite “always wants to be with Turquoise”.
As a result, this form remains “hidden” for the most part. Either way, she has a very boyish and cool personality, and what Petalite and Turquoise cannot achieve, she can. She can use a combination of both Turquoise and Petalite’s abilities, and is an incredibly mobile and acrobatic fighter. They can maintain this fusion for a long time if need be, but again, prefer not to.