Four is the host of bfb,the fourth series of bfdi. Four is a big fan of bfdi,and hates two,he hates when anyone mentions two  to him. He loves x! Four can get a bit obsessive if your very kind. Four has alot of powers. And four can change form. Like the other algebraliens, four sometimes hangs around in the Equation playground. He is nice to seven, sensitive and nervous to eight, OBSESSED WITH TEN , rude to five, nine..is nine to four. Six is okay to four, so is zero. Friends with x. Four is blu