“Why Daleks?” You’re probably thinking. Well, two reasons: one, Daleks are notorious for hatred, so I thought it’d be ironic to put them in the flags commonly associated with love. Two, I like the idea that these Daleks exterminate all homophobes. And with day 18, we have the Bigender Dalek.
It is defined as when someone's gender is two genders mixed into one, and made its first pride flag in 2009. And is 100% valid
More information here: https://prideflags.info/flag/bigender