Marina (Demon Girl)

Marina was born into a family line of Dark Priests that worshiped The Old Gods. Her paternal figure, Father Domek, serves as the current leader of the Dark Priests in Prehevil.

Her mother, not wanting her child to be forced into the Dark Priest lifestyle, wished for a chance for Marina to grow up divergent from her father's religion; which would have otherwise involved a lifetime of worship to The Old Gods. Despite Marina's birth gender being male, her mother decided to conceal her identity to all others, including Marina's father who labeled her child female. This spared her now-daughter from the Dark Priest line of succession that all the eldest sons of Priests must follow.

He is one of the few cases of demihumans born men, but he hides it.

Based on the Monster Musume anime. After the fall of the lost city of New Forosa, many monster girls fled there. Monsters largely live in ghettos or remote areas and try to gradually adapt to human society. But the process is slow, and they suffer a lot of discrimination.
Demihumans are commonly referred to as monster girls as 97% of them are girls and only 3% are born male, some being born human men.
The ADIE is the organization that monitors monster girls

She's a marine from Fear & Hunger, but she's a demon girl. She's short and thin, with black hair, white skin, and demon wings, horns, and a tail.