Four (BFDI)

Four is an algebralian and the main host of BFB, and the host of the non-canon one-episode series, Battle for Permission to Meet 10. Four and their co-host X first appeared in the 2008 video "X Finds Out His Value". They appear to be abstract beings representing real-life numbers, letters, or algebraic variables.

Four exhibits very surreal mannerisms, including being able to deform or mutilate characters, revive them, screech to stun them (killing them on some occasions), eliminate them by sucking them into their body (sending them to the EXIT), and shoot energy beams from their hands.

Four's first appearance in BFB was "Getting Teardrop to Talk", where they lead a game to win a BFDI.

In "B.F.B. = Back From Beginning", Four merged into the Desert. They reformed to their original state in "Chapter Complete."

Four also makes a brief cameo in "You Know Those Buttons Don't Do Anything, Right?".