Leo and Luna

Leo and Luna (Rua and Ruka in the Japanese dub) are twin siblings and two Signers. Lua possessed the heart Mark of the Crimson Dragon. Luca possessed the claw Mark of the Crimson Dragon. They aid Yusei Fudo, who they admire and support, in his duels. They may have been brain-washed into being villains because of Rex Goodwin in the manga (Yusei managed to save them.), but in the anime they were huge heroes.