Neopronoun gay is a term that can be used to describe any gay who uses neopronouns. They could also use other types of pronouns along with neopronouns (ex. a gay that uses he/him could also use xe/xem and still be a neopronoun gay). Any cisgender, transgender, and non-binary gays can identify as a neopronoun gay.
There also exists neopronoun lesbians, he/him lesbians, they/them lesbians, it/its lesbians, it/its gay people and they/them gay people.
History
Neopronoun gay was coined by Tumblr user pwidefwags on August 14, 2019
Flags
The neopronoun gay flag was created by pwidefwags on or before August 14, 2019
Sources
https://pronoun-archive.tumblr.com/post/187017140341/neopronoun-gay-flag