Ooh, it's probably just one of Oda's crumbs, but I just found out that Eris (Rocks' wife/beloved) is the daughter of Nix (Night) [or the original Eris was]. She actually doesn't have a very good rep, although the One Piece Eris seems amazing. Anyhoo, the Ancient Roman name for Nyx (night) is Nox which is Pedro's Pirate crew's name. Nyx is also known as the mother of dawn (Eos) in some tellings, apparently. Pedro's speech sticks with me still (as it should. A major One Piece theme).
Eris was a pirate before she met Rocks, and Rocks and Teach both are agents of chaos; we don't know about her. The darkness and catalyst for further discord can majorly be placed on the World Government, though. Eris seems feisty, loyal and a Ginny-brand of fun, but we've only met her a few times.