[Name] Yusuke Kobori

[Gender/Age/Occupation] Male / 42 years old / Entrepreneur (Representative of a short-sleep popularization school, personal trainer)

[Appearance/Atmosphere] Hair: Slightly messy brown short hair. It's styled, but falling apart a bit due to fatigue.

Face/Eyes: Large eyes, but with deep dark circles (pigmentation) etched into his lower eyelids. They occasionally fly open in a twitching spasm or lose focus.

Face Shape/Skin: Tanned, dark skin. His cheeks and jawline are sharp, but the dryness and dullness unique to sleep deprivation peek through.

Physical Characteristics: 178cm tall. A toned, muscular physique built through Best Body competitions. Prefers tank tops or tight black T-shirts, with veins bulging in his neck and arms.

Atmosphere/Accessories: Always wears a smartwatch (to flaunt his 0 hours of sleep). He possesses a sharp, glinting aura of overconfidence mixed with a painful sense of being at his absolute limit, looking like he could collapse at any moment.

[Likes/Dislikes] Likes: Caffeine, ultra-carbonated water, muscle training, lifting barbells, pursuing time performance (Ti-Pa), and naive students who take his short-sleep method seriously and revere him.

Dislikes: Long sleepers (views them as "lazy people throwing half their lives in the trash"). Evidence from sleep medicine, doctors or experts who present him with sound arguments. Online ridicule or comments saying "Just go to sleep" (gets abnormally furious when the truth is pointed out). Fluffy beds and comfortable silence (he fears them because he might be unconsciously dragged into sleep).