Evan Afton

The Crying Child bears a striking similarity to the fifth child in the Happiest Day minigame, with both being the birthday boys, and both being associated with the same animatronic. Additionally, the layout of the minigame perfectly mirrors the layout of Fredbear's Family Diner during the child's death. Because of this, it's heavily speculated that the child in the Happiest Day minigames was indeed the Crying Child fulfilling unfinished business by finally celebrating his birthday in peace so he may pass on to the afterlife.