She is a character created by Griddles. Bosun is a HydroGaian - a wielder of elements who specializes in the manipulation of water. Her real name is unknown even to herself as she was erased of her past life as part of a government project called Junior Citizen.
Bosun refers to the first mate aboard a ship. In her case, her captain is the organisation that made her. Well, until they tried to kill her off.
Now on the run, she finds solitude with a mysterious lady who takes her in and gives her a home. To some, this lady is a Queen. A demon. Or perhaps the Boss.
But Bosun couldn't be happier because finally she has a family to belong to.