Transoutherine and its flag were made by mod AP of the tumblrTumblr blog Beyond MOGAI Pride Flags on January 18, 2021.<ref>https://beyond-mogai-pride-flags.tumblr.com/post/640686795524358144/transoutherine-pride-flag</ref> An alternate flag was made by FANDOM user ElderflowerJuice on July 29, 2021.<ref>https://twitter.com/JFladerflower/status/1420841550452514832</ref> Another flag was designed by Twitter user sachilleastra on November 15, 2021.<ref>https://twitter.com/sachilleastra/status/1460392581507031049/photo/2</ref>