They are twins.The girl is Nanami and the boy is Ryuutou. They prefer to be called Nami and Ryuu, though. I'm using them in a "Fragile Dreams: Farewell Ruins of the Moon" fanfic. Surprisingly, Ryuu is actually shy. Nami is the same, but she really likes adventure and searching for things. They get along fairly well; they don't argue over trivial things and they behave themselves. They like to hang around with each other because they are /that/ shy.