Archangel Michael heads up an Angelic team which oversees the roles of Angels. Some Angels have been described as fallen Angels. In reality, this is not a true definition. Just as to label something good or bad, would be based on a subjective perspective, or on your level of spiritual attainment.

https://www.goldenheavenonearth.net/post/exploring-the-existence-of-fallen-angels-myths-and-truths