In Greek mythology, Eidothea is the name of an early prophetic sea-goddess. Eidothea was adopted by a group of pirates and grew up to become a pirate captain. She is like a real sea god, spending all her life on the ocean and protecting it.
The ocean gives her power and supports her fight. Eidothea has a hand-held cannon that uses seawater as a power source to attack. The use of anchors to tie up the enemy made her invincible.