Coo holds you in his talons, and you direct his flight with the control pad. This way, you can fly and inhale or attack at the same time.”
— Description • Nintendo Power (Volume #72)
Coo is a friend of Kirby's who appears in Kirby's Dream Land 2 and Kirby's Dream Land 3. Coo is an owl. He is one of Kirby's Animal Friends and is one of only two of them that can fly (along with Pitch). Coo's name is derived from kuu, a Japanese word for air, which implies he's helpful in the air. (It could also based upon the onomatopoeia coo, the term used to represent the noise a pigeon makes.)
Coo transforms into a giant feather duster that Kirby uses.
Coo's flying ability also provides an advantage in many situations, he is strong enough to fly even in very strong wind, just like Kine is strong enough to swim against fast water currents.
For some unknown reason Coo has no friends (or in Pitch's case a mother) like all other Animal Friends have.
He is also a form in Kirby 64: The Crystal Shards when Kirby uses the Stone Friends ability. In this form, Kirby can fly in a tough rock form for a short distance then has to land. Coo's weight works against him in this form as he falls quickly and cannot fly as well as Stone Pitch, also, unlike Pitch, he doesn't roll. A statue form of Coo also appears in Kirby Super Star Ultra when Kirby uses the Stone ability, and in Kirby's Return to Dream Land, Coo is included in the statue of the three original Animal Friends appearing when using Stone ability in said game.
Coo appears in the Kirby Fighters sub-game (as well as in the downloadable Kirby Fighters Deluxe). In the stage Coo's Forest, he occasionally flies through doors and attacks the Kirbys with three feathers in a strikingly similar fashion to he and Kirby's Cutter ability. He then proceeds to reenter the door he came from.
Coo appears in Kirby: Right Back at Ya!, as a wise owl that helps Kirby out in a few situations, mostly involving other animals of Dream Land. Other than that he doesn't appear in the series very often.
When mentioned by other characters, Coo is often held in high regard for his wisdom and judgement, like a wise old sage. Owls often seem to symbolize knowledge.
In the English dub of the anime, Coo has a male voice. In the original Japanese airing, he (said to be a "she") has a female voice.
While Coo has bright purple feathers in artwork and the anime, Coo is usually depicted with dull grey feathers in the games. The 3D model in Kirby: Triple Deluxe goes with the former depiction, breaking the trend.
In the American TV advertisement for Kirby's Dream Land 2, Coo is depicted unusually: In particular, he's given a menacing grin, and also proceeds to lift up and send a biker sliding across a bar table to Kirby.