The Pevensie children are too old for their age.
Their mom notices, at the dinner table. She sees no nagging children, no stupid fights. She sees Lucy eating and speaking with perfect manners, Edmund analysing the economy and war with concerning skill, Susan being gracious but poised, like a diplomat.
Their father sees it in Peters eyes the first time they get into a fight. When he moves to punish Edmund for speaking out of turn, Peter calls him out on it. When his gaze meet his eldest son's, he's leveled by the war he sees behind it, the tensed muscle in his arm, the knuckles white around his knife. He's seen that before, in other soldiers. He doesn't know how to react.
Other children notice, too. Talking to all the Pevensie kids at the same time is like being the only one left out of a secret, and the way they touch and tease each other speaks of a history far deeper than their polite demeneor lets on. And when they walk they fall in line, as if there is a natural hierarchy between them.
The first time anyone picks a fight with Edmund, Peter comes home with a three week suspension and blood around his mouth. He looks more alive than you've seen him in weeks.
When Susan gets back in the pool after Narnia, she wins all the contests. Coaches can't explain how to beat her, because they don't understand how she's doing it, either. She seems to almost disappear when underwater.
Lucy, always gay and golden-haired, starts dancing, and never misses a step. She moves with an elegance that no 10 year old should have, and all the girls want to be friends with her
Edmund soon becomes the best student in his faculty. He always seems to know the right thing to say, and teachers laud his ability to think through complex problems. His mouth does get him in trouble sometimes, but the boy seems uncatchable, always talking his way through the cracks. And if not?
No one actively fears Peter, but everyone is a little scared of him sometimes. He's tall for his age, sure, but there is something else, some other air that seems to give him an authority far beyond what's normal for a teenage boy. He's nice enough, but teachers can't stand it, and bullies learn very quickly that pissing him off means missing teeth and black eyes.
The Pevensies are not quite inhuman, but not fully mortal, either
