Ninjis are jumping black star shaped enemies that appear in some Mario games. There are two types of Ninji; the type that jumps up and down in one spot, and the one that chases Mario and friends around.
Ninjis also appear in Lets-a-go, Mario, sided with Bowser instead of Wart. They attack by jumping up and down, charging at the player, and even fire shurikens and use smoke bombs to drop themselves on the player. They can be defeated by any attack, besides the stomp.
- In the manual for Super Mario Bros. 2, it is stated that Ninjis are seen in the dreams of NES players.