▁M ist - indu ced ▁mem ories ▁of ▁meeting ▁and ▁becoming ▁friends ▁with ▁Jason . ▁Leo ▁uses ▁his ▁s arc asm ▁and ▁wit ▁to ▁hide ▁his ▁feelings , ▁especially ▁in ▁regards ▁of ▁causing ▁his ▁mother ' s ▁death . ▁He ▁sometimes ▁thinks ▁of ▁himself ▁as ▁a ▁sevent h ▁wheel , ▁( as ▁for ▁the ▁first ▁three ▁books ▁of ▁the ▁Hero es ▁of ▁Olymp us ▁series ▁he ▁is ▁the ▁only ▁person ▁ab o ard ▁the ▁Ar go ▁II ▁without ▁a ▁significant ▁other ) ▁though ▁he ▁proves ▁no ▁less ▁important ▁or ▁sk illed ▁than ▁the ▁others . ▁In ▁The ▁Mark ▁of ▁Ath ena , ▁Haz el ▁lear ns ▁her ▁former ▁boy friend , ▁Sam my ▁Val de z , ▁was ▁Leo ' s ▁great - grand father . ▁Until ▁he ▁falls ▁in ▁love ▁with ▁Cal y ps o ▁in ▁The ▁House ▁of ▁H ades , ▁Leo ▁fl ir ts ▁with ▁almost ▁every ▁girl ▁he ▁meets ▁in ▁order ▁to ▁cover ▁up ▁his ▁inse cur ities ▁about ▁never ▁finding ▁love . ▁In ▁The ▁Blood ▁of ▁Olymp us , ▁Leo ▁sacrific es ▁himself ▁to ▁anni h il ate ▁Ga ia ▁and ▁dies ▁in ▁the ▁process , ▁but ▁is ▁brought ▁back ▁to ▁life ▁using ▁the ▁Phys ician ' s ▁C ure ▁and ▁returns ▁for ▁Cal y ps o ▁on ▁her ▁island , ▁O gy gia . ▁This ▁is ▁an ▁impress ive ▁fe at , ▁as ▁nobody ▁has ▁ever ▁found ▁O gy gia ▁twice . ▁He ▁and ▁Cal y ps o ▁then ▁journey ▁back ▁to ▁Camp ▁Half - B lo