Y/n is Ghoulia's human cousin from her moms side, he, however suffers from a deformity in his brain, that slows down most mental functions, and occasional short term memory loss. He is offered treatment by HIDEN Intelligence, a neural implant that integrates to the brain, giving mental processing on the level of a Humagear, he however requires a Humagear Progrisekey, and needs to interface with it once every week (think how Izu and the other humagear place their Progrisekeys over the microchip looking tattoo located on certain areas on their bodies, however Y/n has a visible implant sticking out behind his ear on his neck. His implant is also connected to a computer server). Yua gave her Raidriser and Zaia Spects to Y/n.

Y/n's Humagear Progrisekey has a design like that of the Shining Hopper, Assault Wolf, and Burning Falcon Progrisekeys.

Ghoulia's mother was human when she married her husband, who is a zombie, Ghoulia has a Older Sister named Moanica, who is 2/3rds human as a result of her mother being infected with the zombie virus during pregnancy, which allows her to have the ability speak and walk like a human(or most other speciesin general), very protective of her sister. Ghoulia herself in 1/3rds human, how that equates to super intelligence, who knows.