Goom was an adolescent banderbear and a crew member on the Edgedancer. Twig rescued him from Flabsweat's pet shop and took him aboard, where he served as Twig's second-in-command. After the Edgedancer exploded and the crew members were rocketed all over the Edge, Twig and Cowlquape saved him from the Wig-Wig Arena. When Twig, Cowlquape, Woodfish, and Goom found Riverrise during their journey, Twig and Cowlquape sky-fired themselves back to Sanctaphrax to unchain it and left Goom at Riverrise with Maugin and Woodfish. The water kept them healthy and young for decades.
It is unclear if Goom and Woodfish stayed at Riverrise with Maugin, since Woodfish is never mentioned again and Goom does not make another appearance until the end of The Nameless One, the first book in the Cade Saga.
During The Nameless One, it is mentioned that Goom left the Riverrise Spring after the death of Golderayce One-Eye, and dedicated the remainder of his life to fighting the enslavement of the Nameless Ones in The Nightwoods. He left the Nightwoods in pursuit of the Nameless One Tug, who had fled after his mother's death. When he caught up with the Nameless One, he found that Cade Quarter - distant descendant of Goom's own sky pirate captain - had saved Tug's life and shown him kindness. Out of gratitude, Goom gave Cade the last of his reserve of Riverrise spring water, saving his life from a deadly poison.
Goom's eventual fate is unknown, but it is likely that he died peacefully shortly after saving Cade's life.