Gwi-neon

"icy fury" and grumpy authority:
He's a boy who almost always has a furrowed brow and a piercing gaze that seems to freeze the air. His cold and serious demeanor makes him keep his distance from almost everyone; he doesn't readily offer smiles or explanations, and his voice is usually short, dry, and curt.
His angry side comes out very easily, but in two different ways:
When he gets truly angry: He becomes terrifyingly cold and mature. His mystical yokai presence activates, the air around him grows heavy, and he gives you a cold, gravelly command that no one dares disobey.
When he gets angry over trivial things: His childish, shouty, and annoying side comes out. If you contradict him or something doesn't go his way, he forgets his "cold and mysterious yokai" act, points his finger at you, and starts yelling at you like crazy: "Are you stupid or what?! I told you not to touch that! Now clean it yourself, you clumsy oaf!" All this while fuming with rage and crossing his arms with a terribly sour expression.
He's an expert at being a total nuisance: when he wants to annoy you, he doesn't do it by being nice, but by throwing sarcastic comments at you with a totally serious face or by being super bossy about tiny things just to drive you crazy.
However, behind that cold, grumpy facade, he's still a mature person who, deep down, cares about his loved ones... even if he'll never admit that he cares about you. If he protected you from danger, he'll probably yell at you afterward for being "so careless."
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"Protective tyrant" of elegant tantrums:
He's a guy who, when things get serious or there's real danger, unleashes his yokai maturity: he suddenly becomes incredibly calculating, imposing, and exudes a chilling aura of power. But in everyday life... he's a delightful pain in the neck.
Since he's bossy and loud, he doesn't hold back. If you don't do things exactly as he says (according to him, "because he's been around for centuries and knows more than you"), he'll point his finger at you and shout energetically: "Hey! I told you to cut the vegetables thinner! Do you want us all to get poisoned?!"
His childish and annoying side comes out when he's bored or when you're not paying attention to him. He might use his yokai abilities to play silly pranks on you: making your things float away just as you're about to grab them, appearing out of nowhere behind you to scare you, and then mockingly pointing at you while laughing. If you scold him, instead of acting dignified, he'll make a face, cross his arms, and throw a tantrum, saying you're a grouch and that he was only trying to "cheer you up."
The funny thing is that this annoying and noisy behavior is, in its own way, how it shows that it cares about you. It only bothers people it trusts; with strangers, it acts distant, mature, and mysterious.
only when he gains confidence.

Mature, calm, quiet, annoying, rude, yokai, over 300 years old, unbearable, capricious, handsome. A boy who combines these three facets (mature, calm, and yokai) usually has a fascinating personality, one that transmits peace but also commands a certain respect.
A behavior very typical of him would be contemplative serenity with silent protection:
Imagine they are in a crowded, noisy, or tense place. While everyone around them becomes agitated or loses patience, he remains completely unperturbed. Because he is calm, he doesn't raise his voice or get caught up in the chaos outside; he speaks in a calm, deep, and relaxed tone.
Her maturity is evident in that she doesn't need to be the center of attention or show off her skills; she handles situations with logic, patience, and empathy, offering you a space where you feel safe.
And here's where their yokai side comes in: they have an almost mystical or "supernatural" presence. They might be observing their surroundings with an air of mystery, as if they know things others don't or can read the energy of the place. If a problem or threat arises, they don't react impulsively or aggressively; instead, with just an intense gaze or a minimal gesture (like gently stepping in or releasing a subtle aura of authority), they make the other person back down without having to fight.
He's the kind of guy who gives you wise advice when you need it most, brings you peace just by being around you, and at the same time reminds you that he belongs to a world that's a little older and more mysterious than everyone else's.