They thrive by stealing energy from others through their irritating behavior. This way (one of many ways) of depleting others, can be recognized by the feeling of having been drained after being around them.
Those who employ this method of causing irritation in others to deplete them and energize themselves, require the presence of others as an energy source. They usually employ some endearing behavior patterns in order to prevent alienating others completely — particularly after acting in an annoying way. Others are left feeling guilty that they should be irritated by such a "charming" or "loving" person. This guilt brings them back for more interaction.
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The four relationship types that ensnare: the Clown, the Juggler, the Thief and the Trout, in The Bridge of No Time.