The Light Realm
The Light Realm is the starting area in World of Light. After Galeem vaporized everyone who opposed him (aside from Kirby), Kirby crash lands into The Light Realm with the task of rescuing all captured fighters and defeating Galeem.
There are five bosses present in the Light Realm, with three of them fought in sub-worlds. Giga Bowser is found in the Molten Fortress, Galleom is found in the Base, and Rathalos is found in the Forest Hill.
Since Kirby escaped from Galeem’s attack, he is the only fighter the player has available from the start. The other 73 base roster fighters have been captured and must be awakened for the player to unlock. Downloadable fighters are simply unlocked after the player has awakened a total of 10 fighters. 42 of the 73 captured fighters are unlocked in the Light Realm. 10 of them reside in sub-worlds. Aside from Bowser, all captured fighters must be unlocked through a fighter battle. Mario is always awakened first, with the second awakening being a choice between Sheik, Marth, or Villager. The lists of fighters are organized roughly by order of appearance.