From Mercury Witch Vanadisheart
This is the mobile suit piloted by Ridrick, who was like the ringleader of the terrorists on Earth in the main story.
In Vanadisheart, Ridrick is shown searching for a Gundam on Earth and smiling while looking at a photo of his son.
In the main story, he becomes a terrorist and forces orphans to pilot Gundams into battle... What kind of tragedy caused such a 180-degree change in his position?!

HG Begilbeutolsh (Unit belonging to Ridrick's squad) | なぐ's Gunpla works