Beastgender was coined on January 12, 2020, by tumblr user ashix0trender0juice. The flag was created at the same time.
Other Beastgender identities were coined by Discord user Holly#0696 on August 15, 2021. This was when Beastboy, Beastgirl, Beastfluid, and Beastnonbinary were brought to light. Their flags were created the same date.
One may identify as Beastgender on its own or they may identify as a gender that falls in the category of Beastgender. Any gender combined with the same feelings one identifying as Beastgender feels can be classified under the category of Beastgender. Some common examples of Beastgender identities include: