Yin

Yin, a playable character in Power Rangers: Space Ninjas With Attitude, is the ancient embodiment of natural dualities as explained by Chinese Philosophy (YinYang Symbol). She is the cold and passive, feminine side of the equation; Her other half, Yang, is able to switch places with her although both reside within the other to form a mutual whole, maintaining balance between the physical manifestations and polar personalities.

Trivia

 * When one form is dormant, it crystallizes itself as a solid stone (Yin being a black stone, Yang being a white stone) in the other's staff.
 * Both Yin and Yang are brainchild of Dagdasgirl.