sailor neptune
She is one of the Outer Senshi from the series Bishoujo Senshi Sailor Moon. Neptune uses ocean-based attacks (not just water), and carries one of three Talismans carried by the Outer Senshi. Neptune has the Deep Aqua Mirror, which always reveals the truth. Her civilian identity is Kaiou Michiru.
Neptune is fully dedicated to her duty as a Senshi and fights alongside her partner and lover Sailor Uranus.