When Rita Repulsa's brother, Rito Revolto, came to Earth, he succeeded in destroying the Thunderzords and the Rangers' powers. The six teens had to travel to the Temple of Power, where the legendary warrior Ninjor gave them all the power of Ninja. Using this power, they could all transform into the Ninja Rangers, then morph into Power Rangers and take command of the Ninja Zords. The Yellow Ninja Ranger has heightened strength, speed, and durability. She also has the powers of ground swimming, line of sight teleportation, phasing, multiplication, energy projection, hypnotic persuasion, and many other "ninja magic" powers. Presumably, all Ninja Rangers have the same powers, although not each one has demonstrated all of them.
Master Vile once used the Orb of Doom to revert the Rangers into powerless children. To restore their ages, and obtain new powers, the children had to each retrieve a Zeo crystal.
Aisha obtained hers from Africa, but instead of returning to the Rangers with it, she sent a young girl named Tanya in her place. Aisha remained to help the dying animals of the land.