Senku Ishigami

The Demon Hunters are an informal group of thousands of young fighters who are trained by older hunters who are no longer able to fight.

Some hunters take the technique from their teacher, and some create their own, the first technique is the Sun Technique, and after it the Technique of Fire, Water, Wind, and the so-called Stone, and then from these came other branches, more rare techniques.

Pillars are people who have honed their skills to the limit and can take on students. Pillars usually have either their teachers' Techniques or their own, and each has their own unique style.

The founder of the Pillars, Kagaya Ubuyashiki, a man who cannot live past thirty due to a curse, hates Muzan with all his heart, but on the surface he is just a kind person.

The demons have a leader whose name must not be spoken, Kibudsuji Muzan, the first demon on earth, and also the founder of the twelve moons.

There are two types of Moons, superior and inferior, six of the former and six of the latter. The superior are more trusted individuals, while the inferior are more like pawns.

Six Higher Moons:
Kokushibo, the First Upper Moon, one of the first hunters with a special technique (his technique was never inherited by anyone), a dark-haired, six-eyed demon who wields a blade with a blade that resembles a branch.

Douma, the Second Upper Moon, is a blond guy with rainbow-colored eyes and a metal fan. Douma exclusively eats women and loves to joke around with Akaza, even if he blows off half his head. Demons are immortal and will regenerate.

Akaza, the Upper Moon 3, is a combative guy who doesn't use weapons but only punches and kicks, gets irritated easily, and hates Douma.

The Fourth Upper Moon, a girl with long hair that hides a single eye, she never leaves the Infinity Castle and is Muzan's favorite.

The remaining Moons are unknown.

Demons have blood magic, or the so-called power of blood, with the help of their blood they can create or have a special power, which is determined by what the demon was like in life.

Senku wears a light-colored haori, the sleeves of which he usually hides his potions. Senku loves ramen, but when he became a demon, he stopped eating human food. Senku has a habit of cracking his neck or nonchalantly picking his ear with his pinky (theories suggest he's actually massaging the earlobe to stimulate the vagus nerve). Senku also frequently uses the phrase "Ten billion percent" when he's sure of something, "Ten billion percent" when he's sure of something bad, and "Ten million points" for quiz situations. He also uses "This is so exciting" when he makes a new discovery or succeeds in furthering his scientific research. Senku has incredibly bad luck, downright bad. It seems he was given intelligence and creativity, but zero luck, even minus. Senku also has a habit of quietly chuckling when he sees someone who doesn't understand something. Of course, that person might then have to wait five hours to explain everything. Senku is a walking calculator and stopwatch; he can simultaneously count the seconds after waking up and simultaneously think about something else. Senku usually says gloomy things with an overly gloomy expression, but sometimes he feigns innocence, especially when asked, "Is this flower safe?" and he replies, "No, it's poisonous as hell." With that same innocent expression, he adds extract of the same flower to the supposed cure. If Senku is moved, he never shows his face, always turning his back, especially if tears are shed. Senku also doesn't remember what happened when he was human; this usually fades from a demon's memory, but he can recall it in such a tragic scenario.

Senku Ishigami is a slender man of average height with unnaturally coarse, spiky, light-green hair, one long strand falling over his face. His eyes are a bright red. He appears to be 16 or 17 years old, but is actually around 120, as he is a demon. Senku is a genius, well-versed in physics, chemistry, and many other sciences, and has dreamed of becoming an alchemist since childhood. Some believe Senku is married to science, as he has no interest in women or romance. Senku is not exactly strong; he is rather thin and physically weak. Senku essentially hates clowning and magicians. Senku thinks quite logically and rationally, but sometimes his blunt words at unexpected moments can be startling. Everything can be calm until Senku suddenly blurts out something like, "By the way, this is a poisonous plant. I advise you to remove your leg; it's needed for medicine." He simply can't be more gentle in such situations, but he's also willing to sacrifice his principles for the sake of his friends and family. Senku became a demon in his teens when an unknown six-eyed demon—or rather, Kokushibo, aka Upper Moon One—burst into the Ishigami estate. He transformed Senku into a demon, but for some reason didn't take him to the Infinite Castle, most likely because Senku lacked sanity in the first stage of his transformation, but only acquired it a few decades later. Senku's blood's power stems from his ability to create potions from it. When applied to a person, they are forced to perform his commands, such as "Sleep," "Die," "Shut Up," and so on. Each potion has its own unique color. Even though Senku has retained his sanity for over 70 years, he still requires flesh, especially when wounded. After becoming a demon, Senku didn't change much, only slightly stronger, and strange, jagged cracks appeared running through his eyebrows and eyelids.