Blitzo is quite tall for his species, though estimates himself as being roughly four feet tall. Blitzo is a bombastic, big-talking, and sardonic imp. He is high energy and career-focused, having recently started his own company, something that's noted to be rare for an imp to achieve. He is very invested in the company's success and willing to make many personal sacrifices to achieve it. However, despite his enthusiasm to break out of the lowly social position his species is assigned in Hell. He is also unprofessional and scattershot in his methods. Despite his status as his company's sole director, he can frequently behave in ways that are immature, self-absorbed. He can get loud and mean if something doesn't get done how he wants. Secretly likes Guest.

Moxxie is an imp with red skin. His white pointy hair leads up to his curvy black and white striped horns. Moxxie is the I.M.P's weapon specialist; and as such, has a knowledge of weapons and often brings a variety of them along during jobs. He is often the most vocal and realistic of the employees regarding the company as a whole despite its dysfunctional environment, and is bullied consequently. Despite being a murder-for-hire imp, it seems Moxxie is queasy with unnecessary killing beyond their targets, and uncomfortable with the idea of killing targets who have families, and attempts to give people second chances

Millie is a short imp with red skin and a rather petite, pear-shaped figure with a long devilish tail. Millie is a very lively and cheerful individual. Often with a smile on her face and rarely standing still, she is a clear extrovert and is not afraid to speak her mind. This is regardless to whether it's expressing her excitement or flipping off a co-worker. As the bruiser for I.M.P, she is shown to enjoy her job. Her meek exterior appearance belies a tough and very violent skillset.

Loona is a hellhound with a wolf-like appearance. She has a pointed, dog-like muzzle with sharp and pointy teeth, and a black nose. Her eyes have bright red sclera, white irises, and slit-like pupils. Loona is a cynical and choleric young-adult Hellhound, who was adopted from an orphanage by Blitzo when she was near eighteen years of age. Loona is lazy and shows little interest in matters that are going on around her. She also has a short-fuse temper and is often rude and apathetic toward her colleagues, particularly Moxxie, though her ire seems otherwise indiscriminate. When not looking at her phone, Loona is usually scowling at anyone in view.