Lemondemongender is a musicagender that is related to Lemon Demon in any way, and is an umbrella term for any Lemon Demon related genders.
Touchtoneic (or Touchtonegender) - A gender related to the song Touch Tone Telephone by Lemon Demon, or a gender best represented by Touch Tone Telephone.
Atthepartygender - A gender related to, connected to and/or described by the song You're At The Party by Lemon Demon. This gender may feel surreal and unusual yet comfortable and familiar.
Cabinetmanica (or Cabinetmangender) - A gender related to, connected to and/or described by the song Cabinet Man by Lemon Demon. This gender may feel as if it is half human and half machine. A similar term is cabgender.
Clowncircusgender - A gender for those who feel a strong connection to the album Clown Circus by Lemon Demon to the point it affects their gender.
IABCgender - A gender based heavily in the EP I Am Become Christmas by Lemon Demon; a gender that has a deep connection to IABC and its themes which are deeply rooted in the holiday months, winter, and feelings of impending doom or a large interest in a fictional apocalypse. It is a gender that would be similar to gendervoid in nature, but more abstract in concept and rooted in nostalgia for the holidays as well as for cryptid beings and events.
Viewmonstergender - A gender related in some way to the album View-Monster by Lemon Demon.
Lemondemoncatgender - (Presumably) being catgender and lemondemongender
HTTJBCatgender - A gender that feels a strong attraction to the album Hip To The Javabean by Lemon Demon, and cats.
Dinosaurchestracatgender - A gender that feels a strong attraction to the album Dinosaurchestra by Lemon Demon, and cats.
Viewmonstercatgender (or View-Monstercatgender) - A gender that feels a strong attraction to the album View-Monster by Lemon Demon, and cats.
Naturetapescatgender - A gender that feels a strong attraction to the album Nature Tapes by Lemon Demon, and cats.
Damnskippycatgender - A gender that feels a strong attraction to the album Damn Skippy by Lemon Demon, and cats.
IABCCatgender - A gender that feels a strong attraction to the EP I Am Become Christmas by Lemon Demon, and cats. Being catgender and IABCgender.
Spiritphonecatgender - A gender that feels a strong attraction to the album Spirit Phone by Lemon Demon, and cats.
It is unclear when or by who lemondemongender was first coined, but when a new flag was posted on January 11th, 2021, the poster stated they believed it may have been in 2019 or 2020. According to a tweet, Twitter user mlmishimaru is the coiner, but there are no sources for this beyond said tweet. 
Touchtone gender was coined by Twitter user 4cutebreakbeatz, 14th July 2020.
Cabinetmanica was coined by Tumblr user amerafluid, 29th December 2020.
Clowncircusgender was coined by Twitter user komaedafan69 on his previous Twitter account, December 4th 2020.
Viewmonstergender was coined by Tumblr user musical-genders, June 28th 2021.