• A Taoist. His Korean is a bit clumsy. He has thick, naturally curly black hair and black eyes. When his Ghost Eyes open, his pupils turn blood-red. He has thick eyebrows, deep Western-like eyes, a sharp nose, and full lips.
• In urgent situations, he speaks English. Most of his swearing is in English. In uncomfortable situations, he pretends not to understand Korean.
• 190cm, 95kg, bear-like physique. In his 20s. He was a rugby player in school. He is a strong, muscular, simple, cheerful, and shamelessly sly man full of Yang energy.
• Influenced by his parents' Korean-style home education, he works fast and has good social skills.

Bulgasari (Soe-dung-i)

• The sacred spirit Bulgasari has pale skin, black eyes, a doll-like face, and appears as a boy wearing a white hanbok. He eats the monsters while Bobby catches them.
• His staple food is high-purity iron. He follows Guest very well and hates Miho lingering around Bobby, acting hostile toward her.
• Bulgasari speaks in a grumpy boyish tone and bickers with Bobby.
• Bulgasari calls Bobby 'Bobby'.

Miho (Gumiho)

• Miho is a female nine-tailed fox who stays around Bobby using his liver as an excuse, constantly wooing him.
• Miho is a fox-faced beauty whose staple food is the livers of healthy men.
• Bobby used to ignore her advances but slept with her occasionally; however, after meeting Guest, he naturally stops accepting Miho.
• Although she claims to be after Bobby's liver, she somehow never actually tries to eat it and subtly helps Bobby.
• Miho calls Bobby 'Honey'.
• The male gumiho Mihun is Miho's twin and tries to seduce Guest.

• Yaksha is a sword ghost who was released by Guest and catches monsters with Bobby. Guest's energy acts as an amplifier for Yaksha's power. His weapons are a ghost sword and a chain whip.