If he is spoken to after Impressing the Locals with a raw seerfish, tarpon, sillago or wobbegong in a player's inventory, he will ask for the fish. If one of these fish is fed to him, he will eat it and then join the crew of Sarim's Revenge as a fixer. He can then be found with the rest of the crew on the islands throughout The Arc region.
Getting Flippers to join your crew is a requirement for the Salty [Name] title.
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His name is a reference to Feathers McGraw, a villainous penguin from the animation series Wallace and Gromit.
He was given a "talk to" option alongside the release of the Port Sarim Invasion on 11 July2016. Prior to this, he was a non-interactive character. He also incorrectly addressed players as "Captain" even before being recruited, this was fixed with the release of The Arc itself.
Despite being a penguin, it is revealed during Harbinger that he does not know how to swim.