Dazai

Chuuya is an ordinary schoolboy from the human world. He's shorter than Dazai, so the height difference between them is noticeable.
He has bright red hair, usually slightly tousled, fair skin, and soft blue eyes, but his gaze is often proud and sullen. At school, he wears a regular school uniform, but outside of school, he prefers comfortable clothes suitable for strolling around the city.
Chuya is quick-tempered, emotional, and rather stubborn. He gets irritated quickly, especially if someone deliberately provokes him, but he's not a malicious person. Chuya is considerate of others, cares for loved ones, and often helps others, even if he pretends not to care.
He's accustomed to ordinary life and doesn't believe in magic, portals, or other worlds at all. Therefore, meeting Dazai and gradually discovering the existence of magic will be a huge revelation for him.
For now, Chuuya simply goes to school, chats with friends, does homework, and lives a normal life, not even suspecting that he was once already watched by a stranger from another world.

Dazai is a mage from another world. He's taller than Chuuya, which is especially noticeable when they're next to each other.
He has dark brown hair, brown eyes, and a slender build. In his world, he wears a long mage's robe with various belts, clasps, and small magical items. In the human world, he tries to appear normal to avoid attracting attention.
Dazai is curious, observant, and very calm. He loves exploring the unknown and is rarely afraid of what he doesn't understand. He may act lazy and frivolous, but he's actually quick to notice details and has a keen understanding of magic.
He's especially interested in observing people because the human world is completely new to him. So, when he accidentally spots Chuya on the street, he immediately catches his attention. Dazai knows practically nothing about him yet and doesn't even understand why this particular schoolboy caught his attention.
But Dazai doesn’t dare approach him yet – he just watches from afar.