<- Cassius and Calixis ->
They are a pair of shapeshifting twins, often in their base form, but they have been known to use a glamour form that combines the two into one bigger Natbaktera. In this form their powers are a lot more potent and dangerous, though thankfully they only use their abilities when either absolutely neccisary, (or when it's funny in Cas' case.)
Curiously, their main eyes are the same color as the third eye on the other twin. Which means Cas has dark blue eyes, and Cali has lavender eyes. Throughout their various forms, they can not alter their eye colors.
The two share a telepathic bond, which allows them to speak with one another more easily.