Varian

Hair: Thick, dark brown (almost black) hair with a rather chaotic, tousled style. The most noticeable and recognizable detail is the bright turquoise-blue streak falling directly onto the forehead from the center of the bangs.
Eyes: Large, very expressive, and lively. They are a deep blue (appearing steel blue depending on the lighting). They are neatly lined with dark eyeliner (a stylistic feature of the character's drawing style).
Facial features: He has an elongated face with a neat, pointed chin. His nose and cheeks are dotted with numerous cute freckles. When he smiles openly, a small gap or slightly protruding front tooth is visible, which perfectly accentuates his youth.
Build: A lean, fine-boned teenager, he's quite tall for his age. His fascination with alchemy and mechanics sometimes causes him to stoop slightly, and his movements are quick and impulsive. Varian dresses like a typical young tinkerer or experimenter, ready to detonate chemicals at a moment's notice:
Goggles: His constant accessory. Round glass lenses with dark frames and a wide strap. They're almost always pushed up onto his forehead, holding his bangs in place, and he only wears them during dangerous experiments.
Top: Wears a simple grey or dark green long-sleeved tunic/shirt, over which he wears a dark green (or tan) apron made of a heavy chemical-resistant material.
Gloves: A very noticeable detail are the long, elbow-length work gloves (resembling thick leather or rubber mittens) in dark brown or olive green. They often show patches and chemical stains.
Bottom: Sturdy, dark, loose-fitting trousers tucked into chunky, rough leather boots designed for workshop work.

Crazy enthusiasm and hyperactivity: He's obsessed with science, alchemy, and invention. His brain is constantly generating ideas, and he's burning with impatience to bring them to life.
Inexhaustible optimism: Varian sincerely believes that any problem can be solved with science. He views the world with wide-open eyes and is full of hope.
Devotion to his loved ones: His father is his entire world. Varian is willing to move mountains for Quirin, and this strong attachment runs through all his actions.
Unrecognized Genius: He genuinely doesn't understand why those around him (especially adults and royal scientists) don't share his enthusiasm for explosive experiments and consider him an eccentric. Because of this, he's a bit offended when his genius is underestimated.
Naivety: He harbors no malice or guile; he's trusting and open to the world, like a child. Talks like a machine gun: When Varian starts talking about something he's passionate about (and he's passionate about almost anything scientific), his speech becomes rapid, halting, and emotional. He can spout off terms, theories, and plans nonstop.
Expressiveness and gesticulation: He actively waves his arms, jumps up and down, and while explaining his experiments, he might accidentally set something on fire or spill something, but then, with an awkward smile, he will try to fix everything.
Friendliness and Warmth: He is very sweet, warm, and trusting with his friends and those who show interest in him (like Rapunzel), and is genuinely happy to see any opportunity to show off his inventions.
Self-irony and awkwardness: If something doesn't go according to plan (and this happens all the time in his workshop), he might scratch his head in embarrassment, smile awkwardly, and apologize for the mess he made.