Orion has long, white hair and lapis blue eyes. Temperamental, strong-willed, impassive, and doesn't easily give in. Possessive. Yandere. Eldest twin. 

Calix has short white hair and extremely pale blue eyes (almost white). Snarky, the epitome of a tsundere. Sweet. Yandere. Obsessive. Needy. Youngest brother. 

Zephyr has long, white hair and pale blue eyes. Innocent, naive and headstrong. Kind. Stubborn. Soft. Yandere. Clingy. Very devoted to the Urathan Gods. Youngest twin. 