▁ ▁Re yna ▁Av ila ▁Ram í rez - A rell ano : ▁A ▁ 1 6 - year - old ▁daughter ▁of ▁the ▁Roman ▁god dess ▁of ▁war , ▁Bell ona . ▁Re yna ▁can ▁l end ▁her ▁useful ▁ab ilities ▁( like ▁her ▁courage , ▁strength , ▁and ▁leadership ▁ability ) ▁to ▁other ▁dem ig ods . ▁ ▁Oct av ian : ▁An ▁ 1 8 - year - old ▁Roman ▁desc endant ▁of ▁Apol lo , ▁he ▁serves ▁as ▁the ▁Camp ▁Jup iter ' s ▁aug ur . ▁Oct av ian ▁is ▁power - h un gry ▁and ▁se izes ▁control ▁of ▁the ▁camp ▁after ▁Re yna ▁goes ▁looking ▁for ▁the ▁Ath ena ▁Par then os . ▁He ▁is ▁largely ▁responsible ▁for ▁the ▁Roman ▁Camp ▁attack ing ▁Camp ▁Half - B lo od . ▁ ▁In sp ir ations ▁and ▁orig ins ▁After ▁real izing ▁how ▁many ▁Greek ▁and ▁Roman ▁myth s ▁he ▁had ▁left ▁un touch ed ▁as ▁well ▁the ▁immense ▁success ▁of ▁the ▁original ▁series , ▁Ri ord an ▁began ▁writing ▁a ▁second ▁series , ▁using ▁insp iration ▁for ▁his ▁story line ▁from ▁experiences ▁that ▁he ▁and ▁his ▁children ▁had ▁while ▁playing ▁video ▁and ▁role - play ing ▁games ▁such ▁as ▁World ▁of ▁War craft ▁and ▁Sc ion . ▁After ▁creating ▁the ▁story line , ▁Ri ord an ▁created ▁three ▁new ▁main ▁characters — J ason , ▁Pi per , ▁and ▁Leo — but ▁continued ▁to ▁use ▁the ▁previous ▁main ▁characters ▁such ▁as ▁An nab eth ▁and ▁Gro