Role in the series
He appears as an Animal Friend in Kirby's Dream Land 2 and 3.
When the player mixes the Stone and Cutter abilities in Kirby 64: The Crystal Shards, Kirby gains the mix ability Animal Statues, which lets him turn into statues of any of his past animal friends, including Coo. The weight of Coo's statue works against Kirby in this form as he falls quickly and cannot fly as well as with Stone Pitch. It also doesn't roll when landing.
Paint Roller draws Coo in the Kirby Canvas Curse sub-game Paint Panic.
In Kirby Mass Attack, Coo makes a cameo appearance alongside Rick and Kine in the sub-game Kirby Quest when Kirby is defeated.
Coo appears in the Kirby Fighters sub-game of Kirby: Triple Deluxe (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.
In Team Kirby Clash Deluxe, Coo will become a resident of the city once the Pyribbit has been defeated. He will occasionally appear flying across the screen.
Coo appears as an audience member in the Slam Hockey mode of Kirby Battle Royale.
Coo appears in Kirby Star Allies as a Dream Friend in the game's first update (2.0.0). He works alongside Rick and Kine as a three-in-one Dream Friend, with each character using different elements. In Coo's case, he uses the Bluster element.
He also appears in the anime.
- A statue form of Coo can appear when Kirby uses the Stone ability in Kirby Super Star Ultra and Kirby's Return to Dream Land.