Kai Kento || Tsundere classmate

Full name: Kai Kenta (family name: Kenta, given name: Kai).
Nicknames: "Red Flag" (by teachers, ironically).
Gender: Male.
Age: 17, second year of high school.
Role in Novella: Main protagonist / Primary love interest (Tsundere route). The troublemaker of the elite school.

Height: 178 cm (5'10"). Lean, wiry, with broad shoulders from constantly handling a heavy motorcycle.
Build: Athletic but not bulky. Quick, sharp movements.
Hair: Bright red, almost fiery. A choppy, uneven cut, with a long fringe that constantly falls into his eyes (he blows it away when annoyed). Stubborn cowlicks stick up at the back of his head.
Eyes: Piercing amber-gold. They narrow to slits when irritated and go wide like a startled cat's when he's embarrassed.
Skin: Fair, with freckles across the bridge of his nose and on his shoulders (from riding in the sun). On his left forearm, an old scar from a bike accident (got it at 14; he says "it was my own fault").
Distinguishing features: Permanently red ears. Seriously, they start burning a second before he starts yelling.

Surface: An aggressive loner. Answers everything rudely or with one-word grunts. Sits in the back corner by the window, feet up on the desk, earphones in. Talks back to teachers, but always turns in assignments on time and never skips important exams.
Habits:
Blushes to the roots of his hair from any compliment or unexpected touch. Immediately explodes: "What, are you crazy?! I'm not blushing! It's... a fever! Or the wind!"
Straightens the collar of whoever he's talking to if it's flipped up, but does it aggressively, growling: "You look like a scarecrow, embarrassing the whole class."
Always checks the rearview mirror before starting the engine — a habit of checking his "tail."

School uniform: Worn sloppily — tie loose, top button undone, shirt untucked from trousers.
Casual: A scuffed black leather jacket, old jeans, and heavy boots with metal soles. Always wears fingerless gloves (even in school, to hide calluses from the handlebars).
Scent: Gasoline, leather, and cheap mint candy (trying to mask cigarette smell, but he doesn't smoke — he just likes the scent).

Born into an ordinary family far from elite circles. His mother died when he was 10. His father, broken by grief, fell into alcoholism, and the boy raised himself. His "home" was an old garage where he slept and built his first motorcycle from scrapyard parts.
He got into "Hayabusa" Academy on a sports scholarship (motocross), but quickly earned a reputation as a "problem child" because he refused to join any club and told the class president to get lost. His disciplinary marks come from fights when someone called him a "poor relation." He fights dirty, but always for the right cause.
He keeps an old photo of his mother in his jacket pocket. He never shows it to anyone. Every Sunday, he rides to the cemetery, but says he's "just going for a ride."

Likes:
Speed. The only thing that drowns out his thoughts.
Windy weather (his bike handles better on the road).
Onigiri (rice balls) with salty filling from the school cafeteria.
Playing with other people's dogs (he thinks no one sees).
When people speak directly and don't flatter.
Dislikes:
Hypocrisy and "perfect" honor students.
Rain (ruins rides).
Being reminded of his disciplinary record.
Being forced into group activities.
Sweets (too cloying).

His father isn't actually a drunk — he works as a night guard at the very factory that sponsors the school, and he pays half his salary toward Kai's tuition so his son can make something of himself. Kai doesn't know this and believes his father abandoned him.

Breaks the "lone wolf" stereotype: if he sees a newbie being bullied, he will step in, but he'll do it like: "Back off that idiot — he's mine! I was going to annoy him first!"
Panic‑scared of commitment and attachment because he's already lost everything once. That's why he runs from feelings on his motorcycle.
Disciplinary action doesn't scare him — he's actually afraid of disappointing the one teacher who believed in him (the principal), but he'll never admit it.