A realistic full-body portrait of a superhero representing the Gemini zodiac sign. The character is named 'Quantum Twins' and is unique in being two heroes in one body, capable of splitting into separate entities. The design reflects this duality with two distinct halves of the costume, one side featuring cool colors like blue and the other warm colors like yellow, symbolizing telepathy and super speed respectively. They possess a lean, agile physique and an appearance that balances between youthful and wise. The character should be posed in a dynamic, energetic stance, illustrating their adaptability and quick-thinking nature, set against a background that merges two contrasting environments, embodying the essence of Gemini.