CK

CK (also known as Penquino) is a major protagonist in the Not So Elite Penguin Force series. He also appears in Chill's Cheerios, and he appeared as an antagonist for some reason in The Wacky Awesome Super Duper Nothing Show.

(Not So) Elite Penguin Force
In chapter 12, CK defeated Big Bird by grabbing him by his feet, and throwing him into the ocean.

Chill's Cheerios
In My Tunnel, Penquino is helping finish up Chill's secret tunnel, when R2 comes in and eats him before he eats anybody else.

In Johnny and the Hamburglary Adventure, Penquino tells the others that there is a message from McDonald's.

The Wacky Awesome Super Duper Nothing Show
In Hamburgerz, Penquino wakes up Chill with his sidekick Akbaboy, and threatens him with his secret weapon, Super Mario.

In Nyan Chill, Penquino is the first to be hit by Kamek's spell, although it wears off at the end of the episode.

Trivia

 * CK's name changes multiple times throughout the series. He is called CK in (Not So) Elite Penguin Force, but Shy Guy changes his name to Penquino later in the story. His name changes back to CK in A (Not So) Grand Return, and in The Wacky Awesome Super Duper Nothing Show episode Pranks for Everything.