Have you ever wondered why there is no Sailor Earth? That is because, technically, Tuxedo Mask serves the role as protector of Earth. He possesses the Golden Crystal, which is the Earth's equivalent of Sailor Moon's Silver Crystal.
Every Sailor Scout posses a Sailor Crystal representing their own planet. Tuxedo Mask
is the only known male character to have one. In the manga and Crystal anime, he has a magic attack like the Sailor Scouts called Tuxedo La Smoking Bomber, which blasts energy out of his hands.
The Golden Crystal is supposedly equal in power to Sailor Moon's Silver Crystal. However, it seems like most of the time he throws rose petals, looks dreamy, gets kidnapped, and waits for the girls to rescue him.