*indicates that a character has been removed from game files, and will not return as a mascot.
Other characters have made major or important appearances, and are considered to be famous. Some former non-meetable characters have been promoted to mascots (Rookie, Herbert, and Dot). Some have made appearances as sprite character in game. To be considered a famous non-meetable character, they must have made at least two nonconcurrent appearances.
Some characters have appeared once and were not meetable, but warrant recognition because of their action. Examples include party visitors who were not mascots, or one-off villains who participated only in their event.
After the 2011 Buddy List update, while trying to add a famous penguin to your buddy list, a message will pop, saying you have to meet them, in order to add them as Friends.
Some mascots have special dances for their outfits. Sensei can vanish with his outfit, and the Penguin Band can play their instruments.
Throughout 2013, all mascots were updated to appear in the new penguin art style. As a result, some (Aunt Arctic, Sensei, Rockhopper) were given outfits for the first time. Others (PH, Dot, Jet Pack Guy) were given new or updated outfits.
If you have a mascot as a friend, you can earn the latest background they give out on the Buddy List without meeting them.
On April 25, 2013, Rocky and CeCe's in-game sprites and player cards were completely removed from Club Penguin files, meaning they would not have returned at any point in time.
A common misconception is that all mascots are only controlled by bots. However, they are actually controlled by moderators as well as bots.