Mutio

ミューティオ

Mutio is a water creature created by Zorndyke. Her species is frequently called nereids (distinct from the mythological Nereids of ancient Greece). Because of their internal organ structure and design, they are unable to speak, yet each possesses a very high level of intelligence. The nereids serve as Zorndyke's ultimate Unigumo pilots. They inhabit shallow ocean areas and are programmed for strict obedience, to the extent of suppressing their own feelings.
Early in the series, Hayami saves Mutio when her fighter crashes and she nearly dies. This confuses her, given that Hayami is "the enemy." Later, she reciprocates by saving Hayami when he is in trouble. She also cares for him, feeding him when he is stranded at one point.