Rainbowgender is a xenic aesthetigender under the colorgender umbrella connected to the color spectrum.
History
The term was coined alongside many other colorgender identities by Tumblr user mogai-guy on February 3rd, 2019.
Flag
The flag was coined by Tumblr user mogai-guy on February 3rd, 2019. The second is an alternative flag created by an unknown, with the intent to be used as a simpler version of the flag that eliminates the gradient effect.