Maiar are some of the most powerful beings in The Lord of the Rings—but how do they rank among themselves? There are very few of these beings in Frodo’s story, but Tolkien’s extended legendarium emphasizes how vital the Maiar were throughout Arda’s history. They took part in the creation of the universe and served under the higher-up Valar to help run the world. Maiar fought for good or evil, created and upheld beautiful features of Middle-earth, and one even fell in love with and married an Elf. However, not all Maiar were created equal.

https://screenrant.com/lotr-most-powerful-maiar-ranked-list/