User blog comment:Neowitch/Paranoid Similarities/@comment-4630086-20120131154020

Hmm lemme think. The girls whose joined (aka Nami and Robin) "betrayed" them at some point and then joining again. Nami in Arlong arc and Robin in CP9 Saga. Ah, and if you really expect, we can categorize some of Luffy's crew to elementals: Zoro-wind, Nami-thunder, Usopp-plant/nature, Sanji-fire, Franky-iron and Brook-ice. Also Jinbe-water.

Note: sorry for grammar mistakes...