Goldburn started out as a pearl-like object that Chise Asukagawa happened to find and pick up just after Dynazenon defeated Shalbandes. It started to grow by absorbing her feelings of being left out; be it at school or in the fight against the Kaiju. This culminated in it growing into a dragon-like Kaiju, which Chise named Goldburn after a poster of a band in her room. Initially she attempted to hide Goldburn's presence, but it soon grew too large to do so. Goldburn managed to pick up Yume Minami just as she was about to fall off the same floodgate where her sister Kano Minami died, and then combined with Gridknight and Dynazenon to form Kaiser Gridknight to defeat Gibzorg.
After the final battle against Gagula and the Kaiju Eugenicists, Knight and the 2nd take Goldburn and Dynarex with them as they leave for another Computer World. Chise says goodbye to Goldburn and says that Goldburn is the most amazing friend she has ever had.
- Designer: Tsuyoshi Nonaka
- Goldburn's position in Kaiser Gridknight parallels Gridman Calibur, as they becoming the breastplate to the Hyper Agent's combined form. Whereas Gridman Calibur is a homage to the Gridman Sword and the Plasma Blade, Goldburn's shield form could be an analogue to the Barrier Shield.
- Powers and Weapons
- Size Change Beam: Goldburn fires a beam from its mouth that can alter the size of objects, either shrinking or enlarging them.
- Shield Mode: Goldburn can transform into a giant shield, capable of fully defending against powerful attacks.
- Barrier: Goldburn is able to encase others in a spherical barrier to protect them.