The Gundam Hajiroboshi (ガンダム端白星) is the main mobile suit of the Mobile Suit Gundam IRON-BLOODED ORPHANS Urdr-Hunt mobile game. It is piloted by Wistario Afam.

A Gundam Frame mobile suit that was stored for many years in the administration sector of the Radonitsa Colony floating above Venus. It is unclear when and why the Hajiroboshi was brought into the remote colony, and with the person who discovered it long gone, no one knows why it has been preserved to this day. Additionally, the name "Hajiroboshi", which means Venus in an old language, is not found in the list of the 72 Gundam Frame mobile suits developed during the Calamity War. This name also does not follow the usual naming conventions.

There is evidence that this mobile suit underwent major refurbishments, with most of its armaments other than its Gundam Frame made with modern technology. The Hajiroboshi has excellent maneuverability, and the high output produced by its dual Ahab Reactors are its greatest weapons. However, like the other Gundam Frame mobile suits, Hajiroboshi normally operates at a drastically reduced output due to a specially programmed limiter, but this limiter would automatically turn off upon encountering a Mobile Armor. While this allowed the Hajiroboshi to display its power, it also made the mobile suit difficult to control in the absence of the Alaya-Vijnana System. Uniquely, another operating system would also activate, revealing the sigil of Marchosias along with the text "Gundam Frame Type Marchosias ASW-G-35" on its interface.

The Hajiroboshi was initially equipped with various lightweight armaments made with consideration for the mobile suit's mobility and were designed to be easy to control for its pilot, Wistario Afam. After this 1st Form was damaged in combat with a Mobile Armor, Hajiroboshi was repaired and reequipped at the Radonitsa Colony, becoming the 2nd Form. Besides a new backpack with built-in wire anchors, the 2nd Form also has new armaments in preparation for fiercer battles to come.