Aquarius is a fixed air sign. Air signs (Libra, Gemini, Aquarius) are practically connect to this planet through their intellect. They are fair, so they make good mediators because they love to solve problems. Fixed signs (Taurus, Leo, Scorpio, and Aquarius) round out and stabilize the zodiac. These signs follow the lead of cardinal signs by bringing their ideas to life.
Aquarius is one of the most eccentric signs, and deals with revolution, cutting edge thinking, friendship, and loyalty. Aquarius like ~knows they know~ and can sometimes be stubborn and brutally honest, but they’re the most cosmically connected sign... the out of this world alien-ness of Aquarius somehow brings like this crazy spin to things that are actually really good ideas.
Aquarius is ruled by both Uranus AND Saturn. Uranus rules disruption and abruptness; think literal revolutions and massive change. Saturn is basically the opposite: responsibility, structure, commitment. This is why Aquarius is driven to make the world a better place.