There are many strong characters in Eiichiro Oda’s One Piece, with many of them being pirates, however, there are still a few on the World Governments side too. This here is a list, which highlights the strongest aged characters in the series. (Giants are not included, as they may be 100 years old but they are still young, as they age differently).
This old lady might be one of the strongest female characters working for the World Government. She is a Devil Fruit user, has been fighting pirates since the old era and has elevated herself to the position of Vie Admiral.
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