Nagumo is a handsome man with a tall, slim but muscular build, medium-length black hair, and large black eyes. He has many tattoos, most of which his clothing hides. His tattoos have symbolic, philosophical, and mathematical inspirations, in particular, referencing the Golden Ratio. Nagumo's most notable traits are his laid-back attitude accompanied by his constant smile that seems impossible to wipe off his face. He also has an incredible talent for annoying those around him to the point of making them want him dead. He has a habit of making fun of others with his slightly dark jokes. However, deep down he's a kind and affectionate person. He tends to speak excitedly and in a singsong way, especially when toying with his opponents. Despite this, Nagumo possesses another colder and more serious side of him. He acts on his own agenda most of the time, and sometimes does things to the extent of it being unethical. Nagumo can copy other people's appearances perfectly in an instantHe can also disguise others, including significantly altering someone's body shape. Nagumo was a part of the intelligence-gathering department during his younger days at the JCC. He is a highly perceptive individual. Nagumo uses a large Swiss Army knife-like weapon that has six different functions. He uses a single die to decide which blade he'll use to kill his enemy, or to distract his enemy to deliver a devastating blow.

Osaragi is an adorable-looking young woman of average height with a slender yet shapely build. Her hair is black, straight, and long, reaching her lower back, though she also has shoulder-length framing strands. Uneven, fringed, bluish-grey, emotionless eyes. She wears a dark blue dress with brown floral mesh sleeves, a transparent veil over her head, and black shoes, in a fashion suitable for someone attending a funeral. Osaragi can be described as a childish woman who often acts on impulse without forethought. She exhibits a general sense of apathy, displaying little emotion even in high-stakes situations. She remains composed in battle, engaging in casual conversations and expressing strange, mundane thoughts. She is blunt and tends to shift blame for trivial matters, often pinning them on Shishiba. However, she can also be extremely apologetic, sometimes for things entirely unrelated to her, though she later realizes and acknowledges this. She frequently purchases large quantities of snacks but only shares them on her own terms. In battle, she uses a unique collapsible buzzsaw as her primary weapon.

Shishiba is a tall and slim man in his mid-twenties with long blond hair worn loose and dark green eyes. He wears a light blue polo shirt under a dark brown suit and a purple tie that contains a hammerhead shark-shaped pin. Shishiba is an aloof man who rarely shows much care or concern for anything or anyone unless it is his work or his protégé, Osaragi. However, he believes it's important to kill with concern and respect towards the public, believing that regular civilians have a right to a normal life, having chastised Osaragi about killing so publicly. He apparently finds it hypocritical for an assassin to feel or show signs of vulnerability after someone close to them dies; after all, in a profession where they are expected and expected to terminate the lives of their targets, or die trying, it would be specious to show a faint of heart should a loved one of theirs or even a co-worker get killed in turn. Despite being such a prolific assassin, Shishiba cares little for killing, even comparing it to a chore like cleaning the house. Shishiba's main philosophy in life is "simplicity". His weapon is a pair of hammers that were picked solely because of how simple they are. This is because they can hit or gouge and do not run out of bullets or require sharpening.