Plushtrapboyuwu's Gabriel is a charcter often seen with other demon ocs of the same artist

His name is derived from an archangel with the power to announce God's will to mankind in the Hebrew Bible
the New Testament, the Quran and the Kitáb-i-Aqdas

We don't know much about him compared to the demons due to him not being used too often by the artist

This has led to the user pipopapupupewebghost with the help of the original artist of Gabriel to make a series of stories based on the charcter to try to expand his lore based on the artists original artwork

(Note that these stories aren't directly canon to the original artists lore)

These stories can be seen here: https://www.furaffinity.net/gallery/pipopapupupewebghost/folder/1348911/Main-story-of-gabriel