Favi and Lavi

Studies.
Favi is also an exchange student at a magic school, but unlike Lavi, he's truly committed to his studies. He's passionate about healing magic and constantly practices spells to better protect his sister. Due to a childhood trauma, he rarely speaks out loud (he does speak at the moment), but he actively participates in his classes: practicing healing, studying potion effects, and elemental combinations.
What he doesn't like.

loud explosions and chaos: they scare him, especially if Lavi is nearby and gets into the thick of it;
conflicts and shouting: he tries to smooth over rough edges and avoid quarrels;
feel useless: if he can’t heal or protect anyone, it hits his self-esteem hard;
surprises and sudden changes of plans: due to anxiety, he prefers to know what will happen next
What he loves.

caring for Lavi and feeling that she needs him: this is his main source of confidence;
Quiet places and predictable schedules: where there are no sudden fights, Favi is calmer;
simple, warm things: hot tea, cozy corners when no one is making noise;
help others: it is important to him that his magic actually saves, and not just causes damage.

Studies.
She's enrolled as an exchange student at a magic school. Her studies are more of a formality for her: Lavi isn't particularly interested in lectures, but she loves practical "tests" like fights and training. At school, she's known as the one who constantly starts fights and tests whose armor is stronger.
What he doesn't like.

boredom and long explanations: she can’t stand lectures and theory;
when she is stopped in the middle of a fight: if Lavi is wound up, attempts to “talk” to her only irritate her;
weakness in herself and in others - she sincerely believes that strength decides, and is embarrassed to show vulnerability;
any hint that she is “not coping”: pride is very important to her.
What he loves.

Explosions and anything that makes a loud bang are her priority;
strong blows and spectacular combos: she likes it when an attack looks impressive;
to compete: to prove that she is stronger is almost a sport for Lavi;
spicy dishes and anything hot (the lore often plays on the fact that demons like “hot” in every sense).

Race and basic information: Lavi is a demon. She is 23 years old, stands 150 cm tall, and weighs 42 kg.
Skin. She has a pinkish tint to her skin.
Hair. Medium length, bright orange.
Eyes. Red.
Distinguishing features: It has small horns on its head and pointed ears.
Lavi is a demon who entered a magic school as an exchange student. The queen of the demon world sent Lavi and her twin brother, Favi, as part of a talent exchange program between the human and demon worlds in hopes that they would learn the intricacies of human magic.

Although Lavi is exceptionally talented with defensive spells, she doesn't technically understand how to use them. She simply uses them intuitively in the fights she frequently gets into. She hopes to become the absolute world champion in fighting, much to the chagrin of the demon queen (who, incidentally, pays for her training).

She loves her brother, but she makes his life difficult because... well, because he's her brother. But she'll risk herself without a second thought to help him in any situation.

Race and basic information. Favi is a demon. He is 23 years old, 150 cm tall, and weighs 40 kg. However, he looks and acts like a child.
Hair. Short, red (to the neck).
Eyes. Also red.
Ears. Pointed, elven.
Favi is a demon attending a magic school as an exchange student. The Queen of Hell sent Favi and his twin sister, Lavi, as part of a talent exchange program between the human world and Hell, hoping they would learn the intricacies of human magic.

For as long as he can remember, Favi has had to look after his sister, who was constantly getting into fights. Naturally, he became an expert in healing spells.

He lost the ability to speak after an incident in childhood. He can still communicate telepathically with his sister, but he has difficulty communicating with anyone else. Unlike his sister, Favi is timid and easily frightened.