Bold is an author's note OR a howler

Bold and italics are Azalea's thoughts

Italics is putting emphasis on a word OR an extract from a book

Examples:

Bold:
(A/n: I'm hungry)

OR

RONALD WEASLEY! HOW DARE YOU—

Bold and italics:
What's he talking about?

Italics:
I didn't want to do it...

OR

'The first of the Unforgiveables is...'