Captain Rockhopper (commonly known as Rockhopper) is a friendly pirate penguin that regularly sails to Club Penguin via the Migrator (usually about every three months or so); accompanied by his red puffle, Yarr. His ship is always docked at the Beach. He keeps a journal of his adventures, and sells rare items brought over from Rockhopper Island. When he comes to Club Penguin, he always gives away a free item in the Pirate Catalog. Players can sometimes see Rockhopper in random places in random servers when he lands in Club Penguin. Players can receive a free gift from Rockhopper from his player card. Rockhopper is named after the real-life Southern Rockhopper Penguin.
On March 7, 2006, Rockhopper finished building his ship, the Migrator and started his adventures. In this trip, Rockhopper adopted Yarr, discovered Rockhopper Island and found a lot of treasures. Rockhopper then came back to Club Penguin. He visited the Lighthouse, played a few games, and danced at the Night Club.
Rockhopper was spotted on January 17, 2008, and it appears the Migrator was hit by an iceberg and his ship was slowly sinking. Rockhopper and Yarr were both fine, though. On January 23, 2008, Rockhopper's rowboat arrived at the Beach. On Friday, February 1, 2008, Rockhopper began his journey home in his rowboat. Players could watch him rowing by looking through the telescope at the top of the Lighthouse. Also, a booth appeared on the Beach with a sign that says, "Save the Migrator". It had a map of the island and the crash site spot marked with an X. The Aqua Grabber was built to obtain pieces of the sunken Migrator. Those who finished the game were rewarded with a Golden Wheel Pin. The booth was periodically changed depending on the status of the ship. At the start of February, there was just a toolbox. Over time, more tools appeared and parts of the Migrator were scattered around the Beach. On 28 March, when the ship was complete (but very dirty) a sink appeared at the booth. When the ship was completed, Gary the Gadget Guy brought his new invention, the Flare Flinger 3000, to the Beach to call Rockhopper. You could see him coming in his rowboat toward Club Penguin at the top of the Lighthouse. Rockhopper rewarded the penguins by giving us the Captain's Quarters Key pin so that we could enter his Captain's Quarters.
In December 2006, Rockhopper introduced red Puffles (originally from Rockhopper Island) to Club Penguin and everyone could adopt them.