Arva was a one-eyed, four-toothed goblin first mate of Flynn Fairwind. She was allegedly killed in a tragic harpooning accident. When Flynn won the ship Prowse in dice, he renamed it the Bold Arva, after the goblin. He also hung her portrait in his cabin.
When he was in a pirate crew, it is said that Flynn's first mate was Harlan Sweete. It's possible that when Arva died, Harlan replaced her, or that Arva was his first mate following his pirating days.