Mercury is one of the main protagonists in SolarBalls. He is the first planet from the Sun.

Mercury is a relatively shy planet and is easily intimidated. Due to him being the smallest planet in the Solar System, he is afraid that "what happened to Pluto will happen to him". Because of his small size he is often the target of bullying by Venus, and occasionally, Earth. He is good-natured and careful with his words, as he tries to avoid hurting the feelings of the Sun when he asks if they are fri