The Mobile Warrior Daihagane is said to be an ancient giant warrior who once saved the heavens. This being is essentially a doll powered by a gigantic mechanism, similar to the mechanized soldiers in the Knight Gundam world. The blueprint for Daihagane was discovered and restored by Flamenco Tajima during the "Wind, Forest, Fire, Mountain" era, where it was granted the ability to transform into a "Rigid Steel Form," designed for heat, pressure, and barrier resistance, and was sealed in the Evil-Free Dream Mountain.

The identity of the person who originally drew the blueprints remains unclear. However, it was later revealed that Daihagane, the prototype for the mechanical warriors in later eras, was created using a technique called alchemy that existed in the past. Originally named "Taiyo Steel Cannon," only the characters for "Daihagane" survived due to severe damage to the blueprints. Tajima, left with no choice, engraved these characters onto the shoulder of the restored giant warrior. Henceforth, the warrior was called Daihagane, a name which was first read as "Daihagane" by Buimaru and has been used ever since.

Weapons:
Dai Tekken (Great Iron Fist)
Dai Blade Sword
Dai Gou Gun (Great Horn Gun)
Taiyo Steel Cannon

In BB Warrior No. 130, it comes as a set with its operator, Buimaru, and can be equipped with the weapons of the seven super generals. The kit can also be reconfigured to combine with the Flying Bird General to form the Flying Bird Daihagane. After the battle with the New Dark Army, it drifted in the skies above the heavens for a long time but later merged with the soul of the Fiery Warrior Gundamu and was resurrected in the series "Musha Retsuden Bukabu Makahen." A kit depicting this state was also released as BB Warrior No. 283, adding to the "Musha Retsuden" series lineup.