Ninjas!

Ninjas are real.
Here are some proof:
1. In Penguin Chat, you can be a ninja (old version of CP)
2. Ninja shadows are all over Club Penguin. (Stage, Lighthouse, Ski Lodge, Plaza (without Stage), and Dojo)
3. On the old CP homepage, if you click the big N in “NIGHTCLUB”, you’ll see a ninja.
4. In the CP Blog, when they launched the Jet Pack game, the penguin is darker than a normal penguin. Click here to see the page.