TW: mentions of death and child abuse ahead!
Marshaleo Crimson Abadeer is the genderswapped version of Marsha. Like all of the other gender-sweapped characters from his reality, Marsh was created by Prismo, who wanted to create a universe for himself instead of universes creating from other's wishes. However, because what he did was not allowed, Prismo stored his universe into the Ice King's head.
In the magic world, Marsh was the youngest son of Hana Abadeer, ruler of the Nightosphere, and Elias, a human man. Much like Marsha, Elias died when Marsh was a baby and he was raised by Hana in the Nightosphere. As a child, his mother controlled almost every aspect of his life, leaving him with little ability to protest. Finally, Marsh would end up running away when he was a teenager. He wandered for hundreds of years until he found a cabin to live in with his older brother Samuel, Sarah's counterpart. In the present day, Marsh was living with Samuel and his little brother Roscoe, Rosaline's counterpart, in the same cabin he found centuries ago much like Marsha. However, things changed when the Ice King wound up in Golb's stomach. There, Golb's digestive system reverted the Ice King's crown and reverted Ice King back to Simon. Because of Simon losing his magic, Marsh's world lost it's magic as well.
In this magicless world, Marsh is the second youngest son of Hana Abadeer, a real estate agent and landlord to the city’s apartments, and Elias, a stay-at-home dad. After his father died at an early age, Marsh was raised in his mom’s estate along with his brothers, Marshall, Samuel and Roscoe. As far back as he could remember, his mother has planned out his life for him, leaving him with little ability to protest. As soon as he was able to, he moved out. He ended up moving into an apartment with Samuel. Marsh now works at a bookstore, helping Samuel cover the rent. Because of Roscoe still being in Hana’s custody, Marsha is the only one of his brothers who still has to maintain contact with his mother.