627. These characters seem elementary! Why? 気 土 火 水 光

Answer:

気  KI, KE - spirit, mood (Air)

土  DO, tsuchi - earth, soil (Earth)

火  KA, hi - fire (Fire)

水  SUI, mizu  - water (Water)

光  KOU, hika(ri) - shine, light (Ether)

They all represent classical elements.