"Why are they all staring?" demanded Albus as he and Rose craned around to look at the other students. "Don’t let it worry you," said Ron. "It’s me. … - J.K. Rowling

For instance, this new idea that You-Know-Who can kill with a single glance from his eyes. That’s a basilisk, listeners. One simple test: Check whether the thing that’s glaring at you has got legs. If it has, it’s safe to look into its eyes, although if it really is You-Know-Who, that’s still likely to be the last thing you ever do.

"Do you remember me telling you we are practicing non-verbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me "sir" Professor."
The words had escaped him before he knew what he was saying.

Hermione was very easy to create because she is based almost entirely on myself at the age of 11. She is really a caricature of me. I wasn't as clever as she is, nor do I think I was quite such a know-it-all, though former classmates might disagree. Like Hermione, I was obsessed with achieving academically, but this masked a huge insecurity.