Mir was still in his chain of chaotic thoughts, doing monologues inside his head. Good for him, someone decided to ease him off from his very stiff guarding pose. The Major broke Mir out of his thoughts, telling him that these kids were nothing to worry about. For now, at least. He would've been very relieved if she did not add the "for now" part. Were they going to go through kaiju puberty and start knocking over tables and stuff later on? Would they get kaiju puberty problems and rebel against their higher ups? Spit acid around and fly across the hall like a true rebel? Oh, the terror!
Not to mention he was more guarding(if they needed any normal human's protection anyways) the teenagers just in case a traitor within decided to bust in guns ablaze. But he decided not to talk about that part, as it seemed quite ridiculous and yes, he may have been scared at these kids at some point.
"Yes, ma'am."
Mir saluted to Akane and loosened his posture slightly. And he watched one girl hand out presents to others- so far a hoodie, a gumball machine, and a... leg lantern. Truly a grand collection of humanity's relics that was.