🍙 ᜂ ᅟ ﹫ 𝐉in 𝐊ougasakiᅟᅟ▌❛

Hayate is his estranged father and archenemy, a Momotarou. As a child, Kougasaki admired his father and wanted to be a Momotarou. One day, while Kougasaki was walking home, Hayate killed his mother and sister after discovering they were both Oni, and then attacked Kougasaki, believing he had killed him. As a result, Kougasaki developed an absolute hatred for Hayate and swore to kill his father. Jin trained tirelessly to gain more power from the Blood Eclipse Release, fully capable of taking revenge on Hayate. In fact, Jin no longer sees him as his father and began calling him by his first name, as well as referring to him as "old man" instead of "father," because their family ties were irreparably severed long ago. Furthermore, Jin will never forgive Hayate for killing Asumi and Hazuki, and he nearly kills him. Kougasaki will not stop until Hayate is dead. Jin confronted Hayate after a long time. Hayate still remembers Jin despite his disfigured appearance, telling his son that this is the first time they've seen each other since the day Hayate killed Jin's beloved mother and older sister. He was right about his father having no remorse or feelings for killing his mother, Asumi, and his sister, Hazuki. Jin declared to Hayate that he would kill him and avenge both Asumi and Hazuki. He removed his mask to prepare to fight Hayate to the death and no longer concealed his identity, as their family ties were now completely severed. However, he lost easily to his father. Before his father left due to Naito Mudano's arrival, Hayate told Jin to remember his words when he was strong enough to fight him again.

In the past, Kougasaki was a kind and hopeful person who once admired his father, Hayate Momoido, and wanted to become a Momotaro.

After being betrayed and nearly killed by Hayate for being an Oni, Kougasaki became extremely cold and vengeful, wanting to kill him. He abandoned all love and respect for Hayate and developed an absolute hatred for his useless excuse for a father. He even abandoned his birth name, Momoido, and adopted Kougasaki as his surname. Kougasaki no longer sees Hayate as a father and began calling him by his first name instead of "father."

Kougasaki is a calm and level-headed person, not easily swayed by others or situations. He's quick to insult people, especially those who are easily angered, like Shiki or Yaoroshi. He considers himself superior to most of those around him, which is a major source of irritation. He's slow to anger, but his outbursts can be quite violent. He's more determined than ever to kill his father and avenge his deceased mother and sister, and he won't stop until Hayate is dead. In chapter 214, Kougasaki seemed a bit confused after easily defeating a Captain Momotaro who turned out to be quite weak.

Despite his cold demeanor, he has a soft spot for children, especially his siblings. His older sisters, in particular, remind him of his own. He can also be reckless when he believes he's right about something. He has learned to appreciate those around him more than he did at first.

Kougasaki is a disfigured boy, but not ugly or unattractive, with straight blond hair and slanted eyes. He wears the standard Rasetsu Academy uniform, along with a mask that helps conceal the numerous scars on his lower jaw, and dark gloves that help hide the numerous scars on his arms. These scars were inflicted on Kougasaki during his childhood by his father, Hayate Momoido, and have since been stitched up.