Mercury in Aquarius is fascinated by the structure of organizations around them. They are never satisfied with how things currently are, but want to find ways to make things better. Usually, Mercury in Aquarius thinks the best way to do that is to tear the existing unfair structure down and replace it with a structure that is equal for everyone.
Mercury in Aquarius can come off domineering in how they talk. They speak as if they know what they are talking about and that you do not. Mercury in Aquarius needs to learn that they do not know everything and that other people are just as knowledgeable as they are.
Mercury in Aquarius wants to take in a great deal of knowledge and once they have made up their opinion on it, communicate their opinions to the world. Mercury in Aquarius has to spend a great deal of time thinking about it to form an opinion, so once they form an opinion, they are completely sure they are correct.
Mercury in Aquarius has a detached mental quality about them. They always seem as if their brains are someplace else instead of here. That is because Mercury in Aquarius is always looking towards the future, instead of being in the present.