Technology & Combat Characteristics
This ultra-heavy mobile fighter serves as the commander of the Death Army's ground forces. The monstrous Grand Gundam was far larger than most Mobile Fighters, barely resembling a humanoid form due to its disproportionately large limbs compared to its torso and head (which were about the size of a normal Gundam's head and torso). Its armor could withstand unbelievable amounts of damage, including impact with a rock about as large as itself. It normally moved in a quadrupedal stance, but could stand on two legs if the situation warranted it.
In addition to using its sheer bulk to crush enemies, the Grand Gundam came with several armaments. The "Grand Horns" flanking its head were enormous tusk-like spears which could extend and charge themselves with energy. Its main weapons were the four "Grand Bomber" cannons on its shoulders, which could fire near-unlimited amounts of destructive charges. Each cannon was also equipped with a hand that could be fired on a durable cable. These hands could be used for precision attacks, to cut off enemy movement, or to help the Grand Gundam move more efficiently.
History
As the 13th Gundam Fight continued, the Devil Gundam created Four Heavenly Kings for its protection: Master Gundam, Grand Gundam, Gundam Heaven's Sword and Walter Gundam. The Grand Gundam first appeared when three of the Heavenly Kings attempted to stop Domon Kasshu from reaching the Gundam Fight Finals on time.
When this failed, the Grand Gundam returned again during the Finals. While George de Sand fought Gentle Chapman's John Bull Gundam, the Grand Gundam appeared out of a cloud of black mist after the latter was badly damaged. George barely managed to repel the Grand Gundam by shooting it in the eye with his Rose Bits, forcing it to revert to the John Bull Gundam.
The Grand Gundam returned once more when Chapman attacked Domon's GF13-017NJII God Gundam on Lantao Island. Chibodee Crocket and George came to Domon's aid and managed to defeat the Grand Gundam, but their own Gundams were badly damaged in the battle, leaving them unable to aid Domon against Master Asia.
The body of the Grand Gundam (in quadruped mode) formed the bulk of the Grand Master Gundam, with the wings and claws of Gundam Heaven's Sword on its sides, the main body of the Walter Gundam attached to the back by a tail-like appendage, and the upper body of the Master Gundam replacing the Grand Gundam's head. When the Shuffle Alliance entered the Colony Devil Gundam to disable its power generator, Ulube Ishikawa used one of the Grand Master Gundam's Grand Gundam feet to crush Chibodee's Gundam Maxter.