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Answer:
This is a little different from the other answer but I think it applies as well. Confidence.
Step-by-step explanation:
Not like overly confident, but later on as Percy is discovering himself more he really starts to doubt his abilities, and his abilities to help his friends in the seven (if you've read Heroes of Olympus). So he could really benefit from some self confidence. Sorry that this is only one trait...
bravery, kindness, heroic
it took alot of guts to try and get his mom back in the first book (i think)
he helps people alot in the books as an act of heroism
he is kind to his friends etc