I have Caroline Weasley for chaos children can get into, with the bonus of a younger brother whose probably quite similar as well as herself who is overly curious and energetic. She wont be off to Hogwarts till next year however...

For this years firsties I have Morgan Valenduris who he probably wont meet until Hogwarts unless somehow he meteors' into her existence with some walking disaster like shenanigans or it's the boats or shopping etc. I honestly don't know how she's going to go with this years firsties