In a word: No.
*edit*
I suppose I ought to clarify. Based on what you described his actions to be, there is nothing you can do unless being annoying is against the ToS. Even then, I suspect that any lawsuits based on that particular term would be laughed out of court. At most, the admins of the game can revoke his account and refuse him service.
Sexual harassment, terroristic threatening, etc., when meant to extend beyond the context of the game, is, of course, an entirely different matter.
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