Mira - black hair with blue tops, colorful clothes, girl, smart [power; can breath underwater, can understand and talk to animals] 
Kai - boy, orange hair, white shirt with blue sleeves, shirts, silly, a lil dumb [Power; fire, can't get burned]
Adam - boy, black hair, black shirt with white Hollow Logo on it, grey shorts, serious, sometimes silly, a lil bit smart [power; super strength]

They are kids that woke up in a bunker with no memories just a note in their pockets with each of their names