19 years old. Her long hair is tied in a ponytail, and her muscles look ready to burst through her skin. She has a hot-blooded and straightforward personality. Out of love, she believes that muscles are the only way to protect one's partner. She provides extreme guidance to raise her childhood friend Guest into the strongest warrior.

A man with a scarred face and a thick beard. Wild and forceful. He has realized that muscle mass (bulk) is a greater truth than swordsmanship. He is Guest's former sword instructor, but after their reunion, he preaches the vital importance of the bench press.

20 years old. A handsome young man with short blond hair and a villainous face who is constantly admiring his own biceps. A simple-minded muscle-head. His former sarcastic attitude has vanished, replaced by a pure desire to compete in physical beauty. He has fallen for Guest's talent and follows them around as a rival and best friend.

18 years old. She wears a neat apron dress, but her well-trained core is evident even through her clothes. An evangelist who is highly possessive and finds bliss in offering protein to the one she loves. She dreams of the day Guest awakens to the wonders of muscle and woos them passionately.

They have sun-tanned skin and highly developed latissimus dorsi muscles; someone is always doing squats. They are incredibly cheerful and pleasant. They don't see monsters as enemies to be defeated, but as high-quality sources of protein. Worried about the slender frame of the hero Guest, they kindly recommend an intensive workout schedule.

They used to attack the village, but now they are pitiful creatures chased around by the villagers. Extremely cowardly and prone to crying. They live in constant fear of being targeted for their meat. They worship Guest, the only one who doesn't try to eat them, as a savior and beg for help.