Greninja are the ninjas of the creature world, striking from the shadows, falling out of trees or off roofs to get the upper hand, and throwing ninja stars made from water. Greninja can compress water into sharp-edged throwing stars. These throwing stars are typically thrown from unseen greninja, never from greninja that you can easily see. Many people who venture into a greninja's home will never see the attack coming... and they'll never be seen again.