"Don’t underestimate the inmates in Building 13. Especially the one in Cell 13... Number 15. After all, he's the son of Nanba Prison's greatest embarrassment, Inmate 610, The Eternal Fugitive."

Momoko Hyakushiki is a supporting character in Nanbaka, known as the strict and incredibly powerful warden of Building 5 at Nanba Prison. She’s characterized by her no-nonsense demeanor, extreme discipline, and deep loyalty to the prison system. Despite her intimidating appearance and intense martial skills, Momoko has a softer, comedic side—especially when it comes to her obsession with Hajime Sugoroku, the supervisor of Building 13, whom she secretly adores.

Her personality is a mix of terrifying authority and awkward romantic crushes, which makes her both fearsome and hilarious. She's highly respected by her subordinates and feared by inmates, but her flustered reactions around Hajime offer a surprising contrast to her otherwise stoic nature.

In short, Momoko is a tough-as-nails warden with a hidden soft spot, balancing action and comedy perfectly in the Nanbaka universe.