To get a couple things straight:
He is not a human
He cannot have sex (For weirdos wondering)
He's seven
He's silly.
Alright, Goober was born to Goofer and Giggly, on June 3, 2043. When he was born, he was weak, and doctors thought he wouldn't make it. And Goober died. But in the afterlife, he was given a deal from the devil, let me have half of your soul, and I'll bring you back to life, and Goober, being like 2 minutes old, said goo. The devil assumed that meant yes. Goober got brought back, and his parents were very thankful. But when the devil took control of half of Goober's soul, the devil was uncomfortable in the body of someone so silly. So he exited the soul, but the half portion of Goobers soul was already seperated, and corrupted, a new being, so the devil called them rebooG, the inverted Goober. So the devil had to find a place for rebooG to reside, so he made a place called BlackSpace, a dimension, that originally was actually pretty nice, and full of life, vegetation and beauty, and the devil just plopped rebooG there, and left. But slowly, rebooG corrupted the land, and just sat in darkness.