What will happen if this person gets charged with identity theft?

Someone I know in real life took my full name, street address, and email and signed up for a plethora of magazines, newsletters, subscriptions, and sites. Police told me it was identity theft and I am waiting for the police officer to contact me tomorrow – what all can happen to this person?
This person has never been in trouble before, that I know of.
They also harassment me heavily on a site, and the site owner banned them.
And they also have been driving past my house blaring their horn, I saw the car and saw it was this person, and called the cops immediately.

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