The Scorpio's planet is Pluto. Pluto is the Roman god of The Underworld. Scorpios are often associated with occult, and other gothic things such as skulls, which Hades/Pluto is associated with as well.
Scorpio quote "Very true, just because I don't talk to you about it doesn't mean I don't know about it." They know, don't lie to your Scorpio or the games will begin and they are more ruthless than you and play only to win.