He was eleven years old at the start of the story
"He looked like a normal eleven year old, with blond hair, green eyes and freckles"
Aaron is eleven years old at the start of the story and he's in year 7 (the first year of secondary school). He's already been kicked out of one school for playing with Bunsen burners (among other things, I might release the incident report at some point). He's old enough to get the bus on his own.
He's a "Looked After Child"
"Aaron was officially looked after by his local council. He had no idea where his mum was and his dad lived on the other side of town. His social worker, Mrs Seeger, visited him every few weeks."
Aaron lives in the Autumn Grove Care Home, a residential children's home for children who have struggled in foster care placements. In the story (at least in book one) we don't know where Aaron's mother is, but we learn more about Aaron's dad and the circumstances that meant Aaron had to become looked after by the council. We only get to see it from Aaron's point of view though, and he was quite young at the time.
He dreams of dragons
""It does have to be perfect," Aaron moaned. “I’ve been dreaming about the same cruddy dragon for my whole cruddy life, and I can’t even get his cruddy head right.”"
Let's ignore Aaron's gratuitous use of the word "Cruddy". Instead, let's focus on how he's been dreaming about dragons his whole life. Every night. I don't know whether that would be really cool or really annoying, but I do know that Aaron doesn't like it, and it makes him feel different. Especially because...
They turn up in daytime too
"He hummed to himself to fill the awkward silence, humming music that he usually heard in his sleep."A dragon flew through the ceiling, roaring at an invisible enemy.Crud. That was stupid.Whenever Aaron had the dragon dream there was always the same music. It hung around after he woke up, echoing around his brain like the music at the end of a film. When he hummed the same tune he could see the dragons as if they were right in front of him."
Even Aaron finds this a bit weird. So he does everything he can to make the dreams go away, which brings us to another important thing to know about Aaron.
He doesn't care about getting into trouble...
"Aaron nodded. “I tried to get rid of them once. I figured if I stayed up all night, didn’t dream about the dragons, then it would all go away.”
“Right,” said Julia. “So what did you do?”
“I nicked a load of energy drinks from the corner shop and drank them all in about ten minutes. The staff at the home figured out what I’d done when they found all the empty cans in my room. I was in a whole heap of crud. Sorry, I mean a whole heap of trouble.”
“Oh no! Then what happened?”
“They took me back to the shop to apologise. But I’d just drank all those energy drinks. I started rambling about dragons and I was sick over the newspapers.”"
Throughout the story, Aaron has no respect for authority, probably because people in authority have let him down so many times in his life. He's happy to break the rules if he thinks it will help him.
...But he does care about his friends.
"Aaron sighed as the truth dawned on him. He didn't belong in Celebration Village. He belonged with his friends."
Aaron clearly cares deeply about his friends and would do anything to protect them. His lowest point in the story is the time he fails to do exactly that.