He is attracted to Leo, Sagittarius, Gemini.
Aries has incredible energy and is always willing to try new things; loves leisure, traveling, going to the movies, or going out to dinner. It is scarce for Aries to tell you "no" to something, and for that reason, they are attracted to people who have that same energy. It pairs well with adventurous signs that don't let fear get in the way.
Leo, Sagittarius, and Gemini are three signs similar to Aries in the sense that they are always willing to explore; they are always willing to sign up for anything that is exciting that they will not say no to anything either. Aries needs many times to fuel their energy rather than slow it down. That never, that never.
It is not uncommon to see these signs fight each other, and the good thing is that, generally, they do not last long. Neither is interested in anything that has to do with resentment. The problem is that, of course, opposite poles can often get paid, and that happens often.