Ninja

Ninja is a recurring copy ability debuting in Kirby Super Star.

Kirby Super Star / Kirby Super Star Ultra
This ability is provided by Bio Spark, which in turn can become a helper to Kirby.

Kirby: Squeak Squad
This ability is provided by Bio Spark once again, and Spinni's projectiles (mainly a shuriken).

Kirby's Return to Dream Land / Kirby's Return to Dream Land Deluxe
Ninja returns in 3D, with a new redesign. This ability is provided by Moonja.