Shitennou

Shitennou (四天王; meaning "Four Heavenly Kings")  are characters in Sailor Moon Crystal.

About
The Shitennou are four loyal and faithfully devoted generals and bodyguards of Prince Endymion. Each member was named after a different stone. When the Four Kings were possessed by Metaria's vast negative energy, they became evil and served Queen Beryl and the Dark Kingdom. Once destroyed their spirits reside in Mamoru's Gems.