Avoid possible suspension (high school)?

a friend of mine wrote potentially bad comments (intended sarcastically) which was effectively scientific facts and compliments that could be taken as insults in a girl's yearbook. he has a different sense of humor, mainly revolving around irony. the girl reported it to the office, even after knowing his sense of humor and laughing at comments identical to these all year. she is completely obsessed with him, stating openly to me that she "wants him". my friend has never initiated a conversation with said girl, but she has pestered him for an entire semester. he has asked her to stop. his girlfriend has told her to stop. my friend has several people including myself to vouch for his character and the girl's ceaseless torment of him. my question is this: what arguments should he make to the school authorities? should he bring anyone else into this? suspension now will result in severely detrimented grades and possible graduate activity cancellation. also note my friend has no emotions/feelings, can lie flawlessly, and can fake any personality with ease. these talents may help you determine advice i can give him.