s ▁Cur se , ▁The ▁Battle ▁of ▁the ▁Lab yr inth , ▁The ▁Last ▁Olymp ian , ▁The ▁Son ▁of ▁Ne pt une , ▁The ▁Mark ▁of ▁Ath ena , ▁The ▁House ▁of ▁H ades , ▁The ▁Blood ▁of ▁Olymp us ▁and ▁The ▁H idden ▁Oracle . ▁The ▁character ▁N ico ▁was ▁named ▁after ▁one ▁of ▁Ri ord an ' s ▁former ▁students . ▁ ▁Though ▁he ▁appears ▁to ▁be ▁ten ▁years ▁old , ▁he ▁and ▁his ▁elder ▁sister ▁Bian ca ▁were ▁born ▁in ▁the ▁ 1 9 3 0 s . ▁After ▁Ze us ▁killed ▁their ▁mother ▁Maria , ▁daughter ▁of ▁an ▁Italian ▁diplom at , ▁whilst ▁trying ▁to ▁kill ▁the ▁children , ▁H ades ▁w ip ed ▁their ▁mem ories ▁and ▁placed ▁them ▁in ▁the ▁Lot us ▁Hotel , ▁a ▁place ▁in ▁Las ▁Veg as ▁where ▁time ▁stands ▁still . ▁He ▁is ▁a ▁native ▁of ▁Ven ice ▁and ▁can ▁speak ▁Italian . ▁N ico ▁is ▁initially ▁dep icted ▁as ▁cheer ful ▁and ▁child ish , ▁with ▁o live ▁skin ▁and ▁dark ▁hair , ▁and ▁enjo ys ▁playing ▁M yth om ag ic ▁( a ▁myth ology - th emed ▁card ▁game ▁similar ▁to ▁Magic : ▁The ▁G ather ing ). ▁He ▁takes ▁the ▁death ▁of ▁Bian ca ▁very ▁hard , ▁becoming ▁mo ody , ▁secret ive , ▁and ▁ir rit able . ▁He ▁becomes ▁angry ▁at ▁Per cy , ▁who ▁sw ore ▁to ▁protect ▁Bian ca , ▁but ▁later ▁forg ives ▁him . ▁After wards , ▁he ▁lived ▁in ▁the ▁Under