Gemini and Aquarius make a marvelous pairing. They are both air signs, meaning they live in their minds and fantasies and imagination. They're social, communicative. They interact beautifully with the world and with each other.
They're different in certain energies, because a Gemini likes to dabble at things. A Gemini enjoys learning something new and then moving on, learning something else, and finding out something else and making a new friend. Aquarius is more universal, let's say, in its interests. It loves to study history, and it is a humanitarian in many ways.
The difficulty essentially between them, and it can be overcome, is that Aquarius tends to love on a universal level but has a harder time being intimate, one on one. Gemini loves one on one but then can lose interest fairly quickly. Together, however, they can bridge that. They do find in each other a sort of inventiveness, a living in a fantasy world but also making it real.
They can make money together. They can enjoy living a life that includes a wide world and at the same time are true and loyal to each other.