Dekabutsu



Dekabutsu is a Dai-Gun larger than Dai-Gunzan and functions as the capital city of Teppelin under Lordgenome's rule. After it is destroyed in the battle of Teppelin, it is rebuilt by the new government and made into parliament tower.

Mecha
Dekabutsu is extremely bulky, and has a very uncomplicated humanoid shape. On one arm it has a hand, whilst the other has a giant hammer, and it can deploy a vast amount of Gunmen. The tower on top of Dekatbutsu's head is its docking point for Lazengann, and it can be assumed that, after Lazengann docked with Dekabutsu, the tower was constructed around it.

The tower also provides a unique interface, allowing Lordgenome to control the entire Space Gunman without needing to be inside Lazengann. The Dekabutsu itself seems to project energy to all allied gunman, as normally beastmen-piloted gunman are unable to function during the night (which they did during the battle of Teppelin) and the fact that all beastmen gunman shut down right after Lordgenome's defeat.

Before Beastman War Arc
It is shown in Parallel Works episode 8 and the beginning of the first movie Gurren Lagann The Movie: Childhood's End that the Dekabutsu was used by Lordgenome during his time as a spiral warrior to fight against the antispirals. Specifically, Lazengann is shown to dock with Dekabutsu in the same way that Gurren-Lagann docks with the Arc-Gurren, and becomes the spiral engine for the Cathedral Terra.

After Lordgenome is thrown into despair by learning of the Spiral Nemesis, which is shown to him by the The Anti-Spiral, the Dekabutsu lands back on earth and begins the suppression of humans be unleashing legions of Beastman-powered Gunmen as its footsoldiers.

During Beastman War Arc
After the defeat of Guame and Cytomander, the capital city of Teppelin sheds the towers surrounding it to reveal it is, in fact, a Dai-Gun. Simon charges at Lordgenome in the head of Dekabutsu, but is stopped by one of its fingers, which is tough enough to withstand Gurren-Lagann's giga drill and sends it flying. Dekabutsu then releases an armada of Gunmen and smaller Dai-Guns to fight against Team Dai-Gurren.

Simon and Gurren-Lagann return, with Dai-Gurren backing them up, and ram themselves into the Dekabutsu's hammer arm, puncturing it. Dai-Gurren unloads all of its cannons within, creating a hole straight to Lordgenome's throne room, and launches Gurren-Lagann into it, allowing Simon to fight Lordgenome. Dai-Gurren then uses its remaining explosives to blow off Dekabutsu's the hammer arm, and ejects to safety with its crew.

After the Spiral King's defeat, the Dekabutsu automatically shuts down and collapses.

Before Anti-Spiral War Arc
During the seven years of peace, Dekabutsu was converted into a capital building called parliament tower, where Team Dai-Gurren governed the people from. Simon himself had an office at the top.

During Anti-Spiral War Arc
Dekabutsu, or parliament tower as it is then known, becomes the target of attack by the Anti-Spirals as they attempt to raze it in order to reach the Arc-Gurren, whose spiral engine attracted them.

Trivia

 * The Dekabutsu is parodied in the game No More Heroes 2: Desperate Struggle by a mech called the Santa Death Parade which is piloted by an over-enthusiastic football player.