Here are some famous penguins on Club penguin:

Rockhopper, Kenziebug, Peg245, PeckPeck45, Aunt Artic, Waddley365, Yellowxduck9, Britt1010, BillyBob, Paintboy100, Antras, Jeffrey232, Luigi Rocks, Nintendogz3, Sanity1, Dendo Guy, Screenhog, Gizmo, rsnail, Holagurrl25, Chewit Dude, Watex, Wopa Khan , Loopa Khan, Koopa Khan, Jas603, Kornareso, Letsgomets10, Tylerhere07, Mace, Car23, Trey10, Cheif Pilot, The Fire Admiral, Happy Cesar, Cesarin96, Pengie1548, Sott, Guitarking3, Neversoft6, domy3, Gorlacker, Ice Survivor, Ntalia3, Vital Viper, Vincce, Bambadee, Gary the Gadget Guy, Dragonrustre, Ice Soda, General Thug, Misspinky35, DWCP, mrlightbulb, ghost576, Aguair, oagalthorp, Anakin911, buter95, red589, Haku3443, Tmccartht.

Good Luck finding them.