You can see a sample in Fantastic Beasts and Where to Find Them, on which Harry and Ron have grafffiti-ed their own comments.
His handwriting is inelegant and childish, but perfectly legible.
Harry Potter was a wizard
There is no such person.
No
not in the film, no
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Harry Potter Places
Harry's mission is to defeat Lord Voldermort.
no
In Scotland
unknown
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Harry potters godfather