Four is an algebralien, the host of Battle for BFB, temporary host for Battle for Dream Island: The Power of Two, and the host of the non-canon one-episode series, Battle for Permission to Meet 10. Four and his co-host X first appeared as the main protagonists 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 change mutilate characters, revive them, screech to stun them (killing them on some occasions), eliminate them by sucking them into his body (sending them to the EXIT), and shoot energy beams from his hands.
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