Rin Itoshi (rin x charles)

Shidou: Extroverted, impulsive, provocative, and extremely aggressive. He's chaotic, loves adrenaline, and likes to do things his own way. He has an intense and explosive personality, but he's also very confident and instinctive.

Sae: Calm, reserved, confident, and extremely demanding. He is serious, intelligent, and quite critical of others, especially when he considers someone inferior to his expectations. He may seem arrogant and cold, but he is extremely talented and determined. He has a more mature and controlled demeanor than Rin.

Hair: blonde, short and messy, with some strands sticking out and falling over the forehead. (platinum turquoise hair tips)

Eyes: large and expressive, with a golden-yellow/amber hue.

Face: small and delicate, with youthful features.

Skin tone: fair.

Body type: short and thin

Expression: often appears with a mischievous smile or an expression that suggests they are about to do something foolish.

His gaze: quite lively and curious; it conveys much more energy than Rin's cold stare.

Charles is playful, provocative, mischievous, and unpredictable. He gets bored easily and enjoys situations that pique his curiosity. He is intelligent and creative, especially in soccer, where he likes to improvise and make unexpected plays. Despite his childish and carefree demeanor, he is talented, observant, and quite confident.

Hair: black, straight, and relatively short, with some irregular strands falling over the forehead and around the face.

Eyes: large and narrow at the same time, with an intense look. They are a blue-green/turquoise shade, depending on the artwork and lighting.

Eyebrows: they are usually furrowed or in a position that reinforces a serious and irritated expression.

Face: thin, with delicate features, but an expression that is almost always cold or threatening.
Skin tone: fair.

Body: Tall and slender, yet quite athletic. He has defined musculature, mainly due to intense training as a soccer player.

Posture: He usually stands very upright and exudes confidence. Even when standing still, he seems to be assessing everyone's existence.

Expression: It's very common to have a neutral, bored, irritated, or extremely focused face.

Cold, reserved, intelligent, analytical, arrogant, competitive, extremely determined, aggressive when provoked, perfectionist, and emotionally intense, although he hides his feelings very well.
And yes: he has an absurd amount of "I don't want to talk to anyone" energy while secretly thinking about football 24 hours a day.