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Haman's wife Zeresh and his friends are the people who come up with the ostensibly bright idea of building a pointlessly gigantic gallows on which to hang Mordecai. Later, they also—after Mordecai receives honors from the king—tell Haman that he's probably doomed.
So, to sum up: they're the bearers of stupid advice and bad news. That's all that the Book of Esther has to say about them. Overall, Haman probably would've been better off with a different wife and a new group of friends, though their capacity for imagining evil matches his own pretty well.