Queen (Title)

A Queen is a female monarchic ruler of a kingdom.

Current Queens

 * Boa Hancock is the empress of Amazon Lily.
 * Miss Universe is the queen of the Black Drum Kingdom.

Former Queens

 * Nefertari Titi is the late queen of Alabasta.
 * Gloriosa is the former empress of Amazon Lily.
 * Otohime is the late queen of Ryugu Kingdom.

Translation and Dub Issues
While "queen" is usually written as 女王 (Joō), Otohime was referred as 王妃 (Ōhi).