Irregulars

Irregulars were a type of human in the Third Period. Existing outside the Third Period's established rules, they were typically capable of both great destruction and as well as creation, and were instrumental in bringing about the Four Endings.

Mechanics
Existing outside the established rules of the Third Period, irregulars were beings brought into existence through illogical or even miraculous ways, such as through virgin conception. Irregulars could bring about a "reformatting" event known as the Re_birthday, and were thus considered the key to bringing about the Four Endings. Out of the pair, one twin usually represented destruction, while the other represented creation; because of this, both were necessary in recreating the world, as one destroyed it and the other created it anew. Irregulars born without their twin counterpart tended to be highly unstable and destructive in nature, to the point of being able to bring about the end of entire worlds. As part of their physicality, they were typically born with blonde hair.

Known Irregulars

 * Unnamed Boy
 * Maria Moonlit's children
 * Lucif twins
 * Hänsel
 * Gretel
 * Ney Marlon
 * Allen Avadonia
 * Riliane Lucifen d'Autriche
 * Ma
 * Adam
 * Eve

Conceptualization and Origin

 * In-universe, the narration calls irregulars the "golden key" to creation; Grim the End takes the form of a golden key.

Curiosities

 * The Twin Blades of Levianta are also said to represent destruction and creation.
 * In the Original Sin Story: Complete Edition album booklet, the Ending Boy and Genesis Girl are said to destroy and create the world, respectively.