They are 2B and 9S from NieR:Automata™, a game made by SQUARE ENIX®. They are both YoRHa units, a sofistocated line of automatas, or human-like robots, both of them have white hair and blue-gray eyes. 2B is a bit cold at the beginning, but she can take more confidence and she turns very caring and loyal. 9S is the opposite, he may look shy and cute at the beginning but it's easy to notice a bit more of impulse on his actions, like saying that their enemies "doesn't have feelings" when they do