Ninjas (disambiguation)

A ninja was a penguin who has defeated Sensei in Card-Jitsu. Other types of ninjas were players who mastered an element of Card-Jitsu:
*Ninja, from the original Card-Jitsu
*Fire Ninja, from Card-Jitsu Fire
*Water Ninja, from Card-Jitsu Water
*Snow Ninja, from Card-Jitsu Snow
==Others==
*Ninja, a moderator