Where is Billy? if he died wouldnt he also be in the underworld?

thats true billys is dead, he died around age 10-13 i think, but i belive he isnt in the story much becuase he was rejected sa pamamagitan ng both heaven and hell. so his spirit wonders freely. it would be nice for him to make an appearance again, with bily, grim, and mandy united and back to thier old style comedy

well Billy was kicked out of Heaven and Hell cause he was really annoying so they say he's wondering the earth as a ghost