Bolts Dexter is a main character in his respective anime, recognized as a former detective who once served in a mercenary unit. He is a former American mercenary with a notable obsession for bodybuilding and protein consumption. Physically, he possesses a large, muscular build reminiscent of a weightlifter, is bald, and has brown eyes. For his official duties with the Marginal Service, he wears a tobi shokunin, a dark green boilersuit similar to that of Japanese construction workers, paired with a tight black sleeveless shirt. On casual occasions, he typically opts for form-fitting attire that accentuates his muscular frame.

Bolts has a lively and bold personality, yet he possesses a strong and compassionate heart, earning him a reputation as a kind and dependable individual. He harbors a particular fondness for animals, especially dogs. He is a specialist in hand-to-hand combat, and his explosive power in battle is considered to be among the top of the Marginal Service fighters. In keeping with his heavy-hitting combat style, he also carries the heaviest weaponry. His relationship with his colleague Robin is notably tumultuous, often compared to the infamous dynamic between cats and dogs.