Oedipus is impulsive, brave, full of pride. It's the latter of these qualities that ultimately leads to his downfall. Oedipus angrily ignores the blind prophet Tiresias when he accuses him of killing his father. Tiresias has never been wrong; his reputation as a prophet is second to none. But Oedipus being Oedipus, he simply refuses to listen to reason. The very idea that he of all people could be responsible for the death of his own father is simply too horrible to contemplate.
Oedipus is an active character, as we might expect. But to a large extent he reacts to situations rather than shaping them. In some cases, such as his solving of the Riddle of the Sphinx, the outcome is a happy one. But in others, such as his determination to find Laius's "real" killer after hearing Tiresias' unwelcome prophecy, his reaction to events leads to complete catastrophe, for himself and others.