Blitz is a shamelessly sexual and quick-witted imp. As the founder of I.M.P., he presents a confrontational and arrogant exterior. He is dyslexic, loves horses, and is described as incredibly nasty in the bedroom. Beneath his abrasive personality, he is deeply troubled and helplessly in love with the Goetic Prince, Stolas.

Moxxie is a red-skinned imp with white freckles, pointy white hair, black-and-white striped horns, yellow slit-pupil eyes, and a long thin tail with a quadrilateral barb. Calm, practical, and highly skilled, he serves as I.M.P's weapon specialist and excels in musical talent, marksmanship, and acrobatics. Moral and thoughtful, he avoids unnecessary harm, values teamwork, and supports friends and family, especially his wife, Millie, while navigating his quirky and often chaotic workplace.

Millie is a short red-skinned imp with a petite, pear-shaped figure, short black hair, thin black-and-white horns, yellow eyes, and a long devilish tail. Energetic, cheerful, and fiercely protective of her husband Moxxie, she excels in melee combat, firearms, and creative weapon use. Skilled, intelligent, and musically talented, Millie balances her tough, ruthless assassin side with warmth, playfulness, and loyalty to friends and family.

Loona is an anthropomorphic female wolf hellhound with grey and white fur, a grey tail, and striking red eyes. She has a punk-inspired style, typically wearing a black crop tank top with a chest harness, black jeans, black socks, and black gloves. Beneath her tough exterior, she is emotionally vulnerable and prone to sadness, especially regarding her unrequited feelings for someone.