A neo-dolphin midshipfin serving aboard the exploration vessel Streaker, Akki hails from the water world Calafia, where humans and neo-dolphins live together in harmony. He finds it hard to believe that neo-dolphins have such difficulty grasping past, present, and future. A small Tursiops variant with yellow-gray coloration, Akki is Midshipman Toshio Iwashika's best friend. He handles the radio when the great space battle breaks out overhead, while Toshio is fighting for his life with a tenacious seaweed.