Job 32 - Elihu appears to be a younger onlooker, whether he was friends with anyone else, we're not sure. He knows he is young but is eager to show his maturity. Perhaps to "show off" would be a better description. He is angry at Job and the three other men. He accused Job of acting "more righteous than God."
Job 33 - Elihu thinks he has something better to say than all the rest. The wicked have a miserable life and everyone needs a messenger to tell them what is right.
Job 34 - Elihu distorts Job's claim of innocense and then accuses him of the same sins the others spoke of. He clearly passes unjust judgment on Job. Elihu represents the person who is heard to say, "Someone ought to say something!" Usually that is exactly the person who should keep their mouth shut!