Ambition - a strong desire to succeed and have more power.
This is the fatal flaw of Thalia, she wants power even if she does know she doesn't need it.
If you know anyone who wants power for themselves, kindly remind them that they might not be the best for the task. This is a serious flaw, and must be taken care of. If not, well, look at Thalia. She almost joined the Titan Army because of her ambition.
Annabeth also shows this flaw sometimes.
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Fatal Flaws
RandomA list of the fatal flaws of demigods which might get you killed. It's the best idea to have extensive knowledge on them to have the upper hand in battle.