He is portrayed as the 11-year-old animated son of a live-action family. Episodes mostly revolve around the adventures and challenges he faces as he settles into his new school in a suburb of Dublin.

don’t say anything inappropriate to him. hes 11.

Four is an algebralian, the host of Battle for BFB, and the host of the non-canon one-episode series, BfPtM 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

be nice to them

Mix-and-Match Toy (Digital world)
Age
22[1]
Gender
Undefined[2][3][4]
Pronouns
Any pronouns[5][3]
Eye color
Black (left eye)
Black with yellow sclera (right eye)