Kōken Yasaka

is a third-year student formerly from Daten High School. He is a former member of the Fallen Angels and currently holds the position of Number 1.

Appearance
Yasaka is a tall, lean-built man with dark hair with dark eyes.

His hair is neck-length and slicked back. He also has thin eyebrows, thick sideburns, and a developing beard growing around his face. However, sometime after his first day at Ishiyama High School, his facial stubble developed into a thin beard with a long but thin goatee developing at the peak of his chin, reaching high just below his bottom lip. Yasaka has since shaved his beard, leaving behind the goatee, and his sideburns have grown to the point where they now curve inward towards his cheeks.

He wears a dark, leather jacket left open with the sleeves rolled-up and his collar upturned. His jacket contains two breast pockets, one on either side of his chest. It contains numerous stud-like adornments on the exterior which is particularly notable on the collar and lapels of the jacket. Underneath, Yasaka wears one of his V-neck shirts which are either dark with a light-colored neckline or simply light-colored overall. Yasaka appears to wear dark gloves to compliment his thug-like outfit. However, Yasaka has once worn the standard uniform for Ishiyama with a regular light-colored shirt underneath and without his dark gloves.

Yasaka often adorns himself with accessories. He always wears dark sunglasses which are typically adorned over his forehead, just above his hairline. Both of his ears are pierced with two dark studs on each Yasaka has also worn a dark, rope-like necklace once around his neck.

He also has a distinctive, inverted diamond-shaped scar on his right cheek, which he apparently gained sometime after first attending Ishiyama.

Personality
Yasaka has a very calm, level-headed personality. He reacts calmly in many situations, even when it is one that would normally alert a majority of other people, such as when Oga first reveals himself to the members of the Fallen Angels.

Additionally, Yasaka has an evident fondness for smoking.

History
Yasaka originally attended Daten High School until he transferred over to Ishiyama High School.

Return to Ishiyama High School Arc
Yasaka arrives at Ishiyama High School on the first day of the new semester. He stands behind the school's entrance, smoking a cigarette, and telling himself about how every newcomer at the high school wants to reign at the top of the student hierarchy.

Several days later, Yasaka sits in an office-like room inside a building with two others. Outside, Himekawa waits to begin his fight with Tōjō. One of the people with Yasaka ask him whether he actually can trust someone with as shady of a history as Himekawa. While holding up his left hand, Yasaka states that he cannot but trails off as he prospers the idea of Himekawa taking down an opponent as powerful as Tōjō. He later smiles shortly after the event occurs.

Yasaka is then seen lounging against a sofa at the head of a pool table, crossing his legs and extending his arms out. He, alongside several of the other Fallen Angels, wait for Himekawa to arrive, which he eventually does. Yasaka then calls for Takamiya to start talking and sits in while the first-year speaks, grunting noticeably from afar. Afterwards, he notices a commotion outside the classroom and watches, unfazed, as Oga appears. Yasaka takes no action whatsoever during Oga's brief moment with them and also says nothing when Himekawa concludes what they should do against him.

The Fallen Angels members later head to the Ishiyama campus where most of the members remain inside the cafeteria, including Yasaka. There, they all dine to Suzune's cooking while the rest of their gang is away. When Ogata incorrectly pronounces Furuichi's name, Yasaka points this out but ends up mispronouncing it himself.

The meal is then unexpectedly interrupted after four mysterious meat-like pieces burst through the windows and float before each of them; surprised, Yasaka contemplates what it is. Udagawa tells the delinquents to eat it as it is a present from Takamiya. Yasaka and the others reluctantly eat their shares; afterwards, they feel an immense amount of power surge through their bodies, though Yasaka makes no verbal comment about the matter.

Later, Yasaka and Sally take a walk in the hallways of the school. While taking a smoke, Yasaka and Sally are approached by Hidetora Tōjō who is apparently looking for a person named Furuichi, whom Yasaka is unable to remember.

Quotes

 * (To himself): "There's only one seat at the top of Ishiyama... and all the up-and-coming powers want it."

Trivia

 * Although Yasaka is the most powerful member of the Fallen Angels after Takamiya, making him the first-year's strongest subordinate, he is often mistaken to be Takamiya himself, proven in many other delinquents' own depictions of the former head.