▁jet ▁black ▁hair , ▁a ▁" Med iter rane an " ▁complex ion , ▁and ▁sea - green ▁eyes ▁like ▁his ▁father ▁P ose id on . ▁His ▁mother ▁notes ▁that ▁Per cy ▁looked ▁just ▁like ▁his ▁father , ▁and ▁his ▁friend ▁Haz el ▁says ▁that ▁he ▁has ▁the ▁looks ▁of ▁a ▁Roman ▁god . ▁ ▁Ab ilities ▁ ▁Like ▁most ▁dem ig ods , ▁Per cy ▁has ▁AD HD ▁and ▁d ys lex ia , ▁the ▁former ▁because ▁of ▁his ▁god ly ▁battle ▁instinct s , ▁and ▁the ▁latter ▁because ▁his ▁brain ▁takes ▁more ▁naturally ▁to ▁An cient ▁Greek ▁than ▁to ▁English . ▁After ▁being ▁trained ▁at ▁Camp ▁Half - B lo od , ▁he ▁has ▁developed ▁a ▁Greek ▁fighting ▁style ▁( des cribed ▁as ▁un predict able ▁by ▁New ▁Rom ans ) ▁and ▁is ▁an ▁expert ▁s words man . ▁After ▁bath ing ▁in ▁the ▁River ▁St y x , ▁Per cy ▁was ▁given ▁the ▁cur se ▁of ▁Ach illes , ▁making ▁him ▁inv ul ner able ▁except ▁for ▁the ▁small ▁of ▁his ▁back . ▁He ▁los es ▁this ▁power ▁when ▁it ▁is ▁was hed ▁away ▁in ▁the ▁Little ▁T iber ▁surrounding ▁New ▁Rome , ▁as ▁part ▁of ▁his ▁accept ance ▁there . ▁In ▁addition , ▁he ▁has ▁an ▁" em path y ▁link " ▁with ▁his ▁first ▁friend ▁from ▁Camp ▁Half - B lo od , ▁Gro ver . ▁ ▁As ▁a ▁son ▁of ▁P ose id on , ▁one ▁of ▁the ▁" Big ▁Three " ▁( the ▁others ▁being