The name "Yoiyami" (meaning "twilight") is derived from the image of Venus on the Hajiroboshi. The main color scheme is a dark blue.

The Hajiroboshi is the main component, with parts from Barbatos, Lupus, Astaroth Origin, and Dantalion mixed in. The chin is a transplanted square type. The armament consists of the equipment from the Hajiroboshi and Barbatos, as shown in previous images. Next time, it will be transformed into armor form.

Iron-Blooded Orphans Mixing: HG Gundam Hajiroboshi Modified "Yoiyami" Base Body | 猫に仕える者's Gunpla works