Maiar is a difficult concept for player race. They are not humanoids (unless they want to be), some were so powerful that they are near Valar in power, some weaker, some have some basic nature (water, air, light, fire etc.) some were closer to humans (maiar of Aule) etc.
You can't do "realistic" maiar as player race, so it is up to your imagination to make them.
Have you played Posband it has some interesting ideas.
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