Bao and Mao are characters from the mecha fighting game Cyberbots: Fullmetal Madness.
Bao is very protective of his little sister. He doesn't know about Earth Force's dealings and doesn't care. He just wants to get away from everything safely with his sister.
Bao and Mao are siblings that have been caught by Earth Corps. They manage to escape and find a VA that's programmed for self-defense. Even though they have no piloting experience, the VA still operates fine due to the programming and sheer luck. Together, they pilot the GP-V4 VISE.