Dioscuri

When they speak it doesn't specify names or boy or girl but the user can tell by the female voice and the male voice who is talking also there is four spaces between each one talking. Once there was a set of twins (Dioscuri) who ascended to the heavens to become the shining constellation Gemini. The boy is Castor the girl is Pollux. Dioscuri (Shielder) with berserker affinity, dealing extra damage to all opponents other than Foreigners with no weakness to any classes.