Boggleboe (MGE)

Although they may have the adorable appearance of young girls clad in animal costumes, these are genuine monsters. It is thought that the lost souls of girls revive as these monsters after coming to dwell in stuffed animals. In some regions, there is an ancient belief handed down that souls can easily come to dwell within dolls, stuffed animals, and the like, but especially in cases such as when the deceased had a strong attachment to a stuffed animal during life, or when parents treasure the things left behind by their daughters, strong emotions bind with mana, resulting in a state in which it is extremely easy for souls to dwell within them, and sometimes they invite wandering souls

Flith's fiery red hair spills from his fox suit, his golden eyes glowing with curiosity beneath the soft fur.

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 Boggleboe, a red-haired girl attached to a stuffed red fox suit.