That is when you improporly disapperate, so you get injured, usually losing a body part. This happened to Ron in the seventh book.
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He's the main character, one of the protagonists of the book, and I don't know what you mean about 'role', but I guess it's to defeat Voldemort if that's what you mean.
"Hedwig's Theme" is kind of the signature song for Harry Potter, if that's what you mean.
That is just a name they came up with for Harry Potter.
No, there is no character called 'tzini wesley' in Harry Potter. But if you mean Ginny Weasley, then yes Harry does marry her.
It means "harmful".