Of course there's Harry and the family who he stays with in the school holidays, the Dursleys - Uncle Vernon, Aunt Petunia and the quite spoilt Dudley.
Then there are Harry's mates who he meets at Hogwarts, red-haired Ron Weasley and brainy but a bit swotty Hermione.
Hermione's actually based on JK when she was a girl. Let's not forget Harry's main enemy at school, Draco Malfoy.
And the teachers include headteacher Professor Albus Dumbledore, Professor Snape and Professor McGonagall.