A while ago there was a lab.
A lab using blueprints that were created by Blue.
But the scientists went crazy and instead of just using metal and other stuff to create G.
They also used human organs, blood and a brain from a deceased teenager.
They put G together.
But someone hacked into G and turned her into a monster.
G killed all the scientists and G even ripped apart her brother and sister, H and F respectively.
G was horrified once she took over her body again.
She was a monster now, an abomination made from nothing more than metal and something more.
Eventually G found Blue and became good friends with him.