Robin Williams as Ramon and Lovelace, This was Williams ' last animated feature before his death in 2014 Hank Azaria as The Mighty Sven, an Atlantic puffin Alecia Moore (Pink) as Gloria, wife of Mumble and mother of Erik (replacing Brittany Murphy) Brad Pitt as Will the Krill Matt Damon as Bill the Krill Sofia Vergara as Carmen, Ramon 's love interest Common as Seymour (Atticus 's father) (replacing Fat Joe) Hugo Weaving as Noah the Elder Richard Carter as Bryan the Beach Master Magda Szubanski as Miss Viola (Bo 's mother) Anthony LaPaglia as Alpha Skua Ava Acres as Erik, only son of Gloria and Mumble and Memphis and Norma Jean 's grandson. (singing by E.G. Daily) Meibh Campbell as Bodicea "Bo '', daughter of Miss Viola, and Erik 's best friend. (singing by E.G. Daily) Benjamin "Lil ' P - Nut '' Flores Jr. as Atticus, son of Seymour, and Erik 's best friend. Jai Sloper and Oscar Beard as Weaner Pups Carlos Alazraqui as Nestor Johnny A. Sanchez as Lombardo Lombardo Boyar as Raul Jeffrey Garcia as Rinaldo Danny Mann as Brokebeak Lee Perry as Francesco, Wayne the Challenger, Eggbert and Leopard seal
who plays the krill in happy feet 2
Brad Pitt as Will the Krill Matt Damon as Bill the Krill