Of course Harry exist, the whole books were based round him.

'See Anything yet?' asked Katja.
'A pile of soggy tea leaves.' replied Yasmin.
'All I see.' added Sophie.
'I see something.' said Sarah. All four looked at her. 'A big, greasy black bat with a large nose. Nope, hang on, false alarm, it's only Snape.' Sarah said. All four laughed.
'Well, I can predict one thing.' said Katja.
'What?' asked Yasmin.
'This lesson is a waste of time.' Katja replied. Sarah stuffed everything in her bag. 'Umm, where are you off to?' Katja enquired.
'Anywhere but here.' Sarah replied, shutting her bag. She stood up. 'Miss! I see something in the tea leaves!' Sarah called.
'What! What!' cried Treawlny.
'''You will give up Divination.'' Well, who am I to deny fate?' Sarah said cheerfully and walked out. The 3 girls stared after her.
'Wow.' said Sophie.
'Didn't think Sarah had it in her.' added Yasmin. The bell went and the three scrambled out after Sarah. They caught up to her as she sat in the great hall.
'Oh Hello!' she said. The three sat next to her. 'What?' she asked. Sarah blew her fringe out her eyes.
'What was that!' Sophie finally managed to say.
'What?' asked Sarah, apparently very interested in her jacket potato.
'You just marched out of Divination!' exclaimed Katja. Sarah shrugged and walked out and along the corridors. Katja, Sophie and Yasmin ran after her.
'Is this not sinking in? Remus is going to murder you!' exclaimed Sophie. Sarah shrugged again.
'Just because he's my god-father doesn't mean he rules my life.' Sarah said. Katja sighed, and had to admit Sarah had a point. You couldn't rule Sarah's life. Suddenly an owl flew towards Sarah and dropped a letter on her head. Sarah picked it up, and slit it open. Her eye's widened as everyone crowded round to read it.
Sarah looked at them.
'You lot are gonna be there with me.' she chocked out.