] ▁sense ▁of ▁humor " ▁and ▁is ▁also ▁" based ▁on ▁many ▁of ▁the ▁students ▁[ he ▁has ] ▁had ▁in ▁the ▁past ." ▁ ▁Character ▁ ▁In ▁the ▁story , ▁Per cy ▁Jackson ▁is ▁port rayed ▁as ▁a ▁dem ig od , ▁the ▁son ▁of ▁the ▁mort al ▁S ally ▁Jackson ▁and ▁the ▁Greek ▁god ▁P ose id on . ▁He ▁has ▁AD HD ▁and ▁d ys lex ia , ▁alleg edly ▁because ▁he ▁is ▁hard w ired ▁to ▁read ▁An cient ▁Greek ▁and ▁has ▁in born ▁" b attle field ▁ref lex es ". ▁Per cy ' s ▁birth day ▁is ▁August ▁ 1 8 . ▁In ▁the ▁first ▁novel ▁of ▁the ▁series , ▁The ▁Light ning ▁Th ief , ▁he ▁is ▁twelve ▁years ▁old . ▁ ▁His ▁person ality ▁is ▁described ▁as ▁" change able ▁like ▁the ▁sea " ▁and ▁hard ▁to ▁predict ▁— ▁with ▁the ▁important ▁exception ▁that ▁he ▁is ▁danger ously ▁loyal ▁to ▁his ▁friends ▁and ▁family . ▁The ▁god dess ▁Ath ena ▁describes ▁this ▁as ▁his ▁fatal ▁f law . ▁Per cy ' s ▁" pow ers ", ▁which ▁start ▁small ▁and ▁develop ▁as ▁the ▁books ▁proceed , ▁include ▁cont rolling ▁water , ▁making ▁h urr ican es , ▁breath ing ▁under water , ▁and ▁talking ▁to ▁horse - like ▁animals ▁and ▁fish . ▁He ▁also ▁becomes ▁an ▁accomplished ▁sword - fig h ter ▁and ▁leader . ▁Through out ▁Per cy ▁Jackson ▁& ▁The ▁Olymp ians , ▁Per cy ▁grows ▁more ▁confident ▁and ▁brave . ▁He ▁serves