Ahura Mazda is most powerful. He created Spenta Mainyu and Angra Mainyu. They have free choice of the principles they embrace. Spenta Mainyu chose Asha (good) and Angra Mainyu chose Druj (evil), thus the advent of dualism. We are all products of dualism. This ideology has prevaded the entire Western World. There are also Righteousness and Wickedness, Order and Chaos, Truth and The Lie (Persians are in the Truth category -- everyone else is part of The Lie). Each side has an army. Spenta Mainyu has the Ahuras. Angra Mainyu has the Daevas. Ahura Mazda is on the side of Spenta Mainyu. They eventually merge into a single god Ormazd. Angra Mainyu becomes Ahriman.
There are also a number of "archangels" in several categories:
(1) Amesha Spenta, "The Blessed Beloved Ones." There are six of them. Each has two characteristics: something in nature and some human virtue.
(2) Yazata. There are 40 of them. They are all standard gods. The most famous is Mithras whose cult spread throughout the world. He was a god of oaths and vows and contracts, all of which were sealed by swearing to Mithras. He is shown grabbing a bull's head and thrusting a sword into it. His name comes to mean "contract" as a common noun.