Gemini - The Sign of the Twins Ruling planet of this Gemini sign is Mercury. The people who were born in this sign of Gemini are widely known for their dual personalities and have the ability to change their mood easily. The Gemini born are fun loving and hate to be tied down. They are lively, entertaining and romantic partners. The twin sides' nature of this dual Gemini zodiac sign is seen continuously pulling in opposite directions. Their brains are subtle and brilliant but at times they lack continuity in the work they do. They have inner belief of being truthful, constant, faithful which they may be at a given moment, but every moment to them has a separate existence.