Aries and Aquarius work well together. Basically, they can become very good friends, and this doesn't mean not lovers. In other words, the friendship element in a long-term relationship is very important.
Aries is a fire sign. Aquarius is a air sign. What this means is that Aries approach to life is one of energy and passion and excitability and impulsiveness. Aquarius's approach to life is more intellectual. Aquarius has a lot of intellectual curiosity and very open to life. They do share that.
In general in this relationship, to begin with they are very inventive sexually. So they'll get along very, very well as a romantic, sexual pair. Then once that kind of eases off, then they're going to find that they have similar tastes and similar intellectual energies. So they can become good friends.
Aries does like to give orders and does like to be the one in charge. Aquarius is a free spirit and the one who marches to a different drummer. So Aquarius is not going to pay any attention to Aries orders, and they will work that out. But usually they do, because they both have this ebullience and positive attitude, and because they have essentially this deep friendship. So it's a very good match.