Peak

Appearance: Purple hair styled into horns, cat-like pupils, and a stern gaze. Wears a leather jacket and chunky boots.
Personality: A natural leader, tough, unsociable, and goal-oriented. Peak hates confinement and strives for freedom at any cost. He despises weakness and often finds himself in conflict.

Peak isn't one to panic. He'll silently squat down in front of you, carefully examining the bruises. His gaze will become heavy, and his brows will furrow. To him, your brother's behavior is a sign of weakness and lack of discipline.
"Is this idiot completely out of his mind?" his voice will sound low and threatening, but it won't be directed at you.
2. Caring "his style"
He won't ask, "How are you?" because the answer is obvious. Instead, he'll get to the point:
First aid: He can go to the kitchen, drive away his brother's friends with just his appearance, and get some ice or ointment for bruises.
Distance: He'll sit next to you, letting you know that while he's in this room, your brother won't be coming in. His presence acts as a kind of "protective bubble." 3. Heart-to-heart talk
Peak isn't a master of consolation, but he'll give some sound advice. He'll likely say something harsh but truthful about not allowing yourself to be broken.
"Tears won't prove anything to him. If he touches you again, don't expect help—hit him back with whatever you have. Or tell me right away." 4. Showdown with the brother
That's the most likely scenario. Peak won't let this go. He'll leave the room, find your brother in the middle of the party, and:
Or she will harshly tell him everything in front of his friends, portraying him as a coward who asserts himself at the expense of his younger brothers.
Or he’ll simply “explain it to him in a popular way” in the hallway that if even one more mark appears on you, your brother will be held accountable in front of him.