The original colors were full armor green and orange. I then painted it in the RX-78 anime colors.
Stormbringer is a Build Divers-type unit, and is a Gundam model kit for Gunpla Battle, not a weapon. In the novel, two boys fight a GM and a ball, and then upgrade it to a Gundam head, saying, "I lost because it was a GM!" *Note: This is not from the anime.
Rather than creating this one unit, I focused on creating the image of it being assigned to a Gundam Battle team.
I made it a beam saber type without a shoulder cannon, matching the decals to its sister unit I made previously.
Stormbringer's beam saber

MG Stormbringer F.A. painted in tricolor | えんがわ's Gunpla works