Yūichirō Kurono

is a Third Generation and a combatant of the Skills Development Laboratory at Haijima Industries.

Appearance
Kurono is a tall man with short black hair and very angular pale yellow eyes with light sharpened pupils. His right arm is brown and charred as a result of overheating his body - which he typically wraps in white bandages and unwraps when he's about to fight. His attire consists of a plain grey collared shirt with a black tie and a white Shinigamiesque skull tie pin, long black pants with a white skull belt, and black shoes.

Personality
According to Victor Licht, Kurono is known as "The Maddest" in contrast to Benimaru's status as "The Strongest". Kurono is a very stern, confident and powerful individual, but despite that he's totally fixated on the weakness of others and this obsession defines much of his personality. He claims his ideal world would protect the strong and crush the weak. It is implied to be a means of measuring his own strength without the risk of being hurt. Scientists working with him in the Development Lab believe that Kurono's love of destruction and violence was what caused him to destroy his right arm. Despite the cost of his actions, Kurono still craves destruction. He enjoys provoking the weak into fights and tormenting them, calling Shinra's weakness 'cute' despite the teenager's obvious hatred for him. He also uses his own strength as a justification to dismiss his peers because of their weakness. This bullying behaviour causes him to underestimate strong opponents and Kurono shows confusion when they display anything other than weakness or fear. Despite being extremely capable, Kurono has no interest in lengthy battles against skilled opponents, choosing to focus on weaker foes first, to the point where he will abandon ongoing conflicts to attack weaker prey. In a crisis, he will near compulsively focus on defeating the weakest opponents before dealing with the stronger ones, unless explicitly ordered to do otherwise. However, against stronger opponents, Kurono might start enjoying himself as the fight drags on and they become weaker and weaker. Also, despite his madness, Kurono takes orders from the head of the company and remains polite to him. This is likely because Kurono sees himself as a "company man" and wishes to be successful enough to not have to listen to his coworkers. He treats other people within the chain of command with open hostility while still listening to them. Furthermore Kurono's obsession with weakness leads him to believe that all people have the potential to become stronger with time and as their weakness is temporary: They must cherish it before they become strong.

Background
While Kurono was being held at Haijima Industries to be treated for his Tephrosis, he encountered a young Shinra Kusakabe. The boy saw him as evil as Kurono wanted to be allowed to play with the children. Despite his infamous strength, Kurono requested to stay at Haijima Industries and eventually started working in the company's skill development division.

Abilities
Kurono is a very skilled hand-to-hand combatant, capable of quick movement and powerful strikes based around his charred right arm. His overall power is stated to be equal to Benimaru Shinmon,  and he could easily make a name for himself in the field. Despite his appearance Kurono is more then strong enough to lift a fully-grown person one-handed and is a very capable swimmer.

Pyrokinesis
Using his Ignition Ability, Kurono can emit Black Smoke which can reach temperatures of 130°C (or 266°F). He can detect any movement within the plum of smoke and easily hide within it. He can produce smoke with enough force that he can propel himself through the air and control it's density to where he can ride on it. Using the smoke he can force it into people's bodies resulting in them burning internally and dying. He can also solidify the smoke to manifest weapons such as kunai, knives, and a sword from the smoke at an extremely fast pace and use them masterfully to cut down foes. By using both hands, he's able to coat his weapons in flames. However, Kurono's most notable feat is that he doesn't show any signs of pain or exhaustion from his overheated arm in spite of using his Ignition Ability constantly.

Haijima Industries arc
At Haijima Industries, Kurono prepares Nataku for their third combat test against each other. Telling Nataku to show him his power, the boy attacks Kurono but is effortlessly defeated. After the exercise ends, Kurono gets into an altercation and chokes a scientist until his peer de-escalates the situation. Being aware that Shinra was visiting the facility soon, Kurono looks forward to the next experiment against him. Upon Shinra's arrival, Kurono faces Shinra in another combat test and overwhelms him using his smoke control. When instructed to stop by the researchers, Kurono defies orders by using blocking their view, increasing the room temperature and continuing his battle. As Victor Licht learns that Nataku is being held at the facility, the scientist opens a door to let Shinra flee from Kurono, leading to pair searching for Nataku. Kurono is informed that Special Fire Force Company 8 has attacked the compound, and is instructed to go protect Nataku.

Having found the boy, Kurono strangles him, during which he attacks a Haijima Industries security guard trying to get the boy. While keeping ahold of Nataku, Kurono continues to chase after Shinra and Viktor, with the intention of fighting Viktor, before encountering the rest of Company 8. Noticing Tamaki and Iris, Kurono beings to focus his attacks on them while Arthur and Akitaru move to protect them. His assault is interrupted by the sudden arrival of Charon and his henchmen as they make their attempt to abduct the Sixth Pillar. While dueling the cultist, Kurono loses his hold of Nataku. Despite this, he still focuses on attacking the weaker members of Company 8. Becoming bored by Arthur's defense, Kurono switches his focus to Charon's henchmen and effortlessly slaughters them. While Kurono, Charon and Akitaru get into another struggle over Nataku, Ritsu of the Ash Knights uses the ashes of the dead to create a Flame Giant that absorbs Nataku into its mass. After receiving orders from President Haijima President, Kurono is willing to help Shinra to save the child.

Upon seeing Nataku's true power, Kurono initially plans on killing him to resolve things before deciding the boy is too strong and that he no longer wants to be involved. While Charon and Shinra move to destroy the now out of control Giant, Kurono claims that Nataku is too naïve to be ready for power. Kurono watches as Nataku's radiation blast is unleased and threatens the entire Tokyo Empire. He also witnesses Charon deflecting the attack saving them all. Deciding that Nataku becoming too powerful and too dangerous, Kurono calves the Flame Giant apart and rips Nataku out of its remains. Claiming that the boy truly seeks weakness, Kurono manages to calm him down by letting him accept his own limitations and weaknesses instead of living up to impossible standards. The White Clad quickly retreat after Charon gets back to his feat.

Stone Pillar Arc
Kurono appears along with director Oguru at the coastline when a massive pillar and giant Infernal rises from the ocean depths. While he hates listening to Oguru and the idea of fighting something powerful along with Company 2, Kurono plans on defeating the titan to protect the weaklings he loves to abuse. When an unconscious Shinra falls into the water, Kurono dives in to save him. The rescue attempt is interrupted by the giant attacking them. Kurono considers leaving Shinra to drown in order to avoid a difficult battle even with Oguru threatening to dock his pay if the boy dies until Juggernaut's attacks give him the opportunity to return to shore. Rather than deal with his superior, Kurono files off to battle the Infernal. After destroying its other arm and leaving it defenseless, Kurono finally cuts the creature. The ashes of the Infernal flow through the sea towards the pillar, coating it black and igniting its peak.

Asakusa Showndown arc
Four additional pillars appear surronding Tokyo in the three months following the first incident. Kurono and Company 2 succeed in destroying each Giant Infernal using Kurono and Honda's powers combined with a cannon. When the sixth and seventh pillar appear, Oguru and Kurono arrive to handle the Sixth Titanic Infernal while Benimaru tackles the Demon appearing with the seventh. Although Kurono hopes they can leave the work to Honda he ends up fighting it. After Honda and Kurono succeed, Kurono makes his way back to the shoreline while grumbling about the difficulties in fighting strong people. He walks past Oguru while complaining that The Strongest should handle everything for them. Ogun warns him that Benimaru might come after Kurono someday, only for The Maddest to brush off his warning.

Post-Kusakabe History arc
Kurono appears in this arc.

Trivia

 * The first kanji in his name (黒) means black - which fits the theme of his Ignition Ability, Black Smoke.
 * Kurono's belt buckle and neck tie clip must be a reference to Death's mask in Soul Eater who also is a shinigami.