Persephone Quarius

The "Empress of the Underworld".

Is said to have been a former princess kidnapped from a Spring Island in West Blue, by underworld boss Drug Peclo.

Background
Persephone was born in West Blue, myths surround her former life and disappearance but it is known that she was raised as the child bride of Drug Peclo - one of the Emperors of the Underworld.

Early Life
Persephone bargained with Peclo to at first spare her mother's life, agreeing under coercion to become his bride at age 14 and he agreed to spare South Blue (at the time).

She observed the brutality of Peclo's operations and realised that West Blue was one of the few seas that presented Peclo with a challenge to his immense underworld empire. His compromise to retreat from West Blue lead to a period in which Peclo's empire grew stronger in East Blue helped by his connections with the Arlong Pirates (prior to their defeat by Straw Hat Luffy).

Persephone recognized an opportunity to seize control of his empire and sowed rumours that Peclo was afraid of West Blue, which eventually led to a hasty re-entrance into the new territory of Capone "Gang" Bege, who killed Peclo and allowed Persephone to take his place as 'Underworld Empress'.