Sisquiede was an extremely high performance suit, easily surpassing many mobile suits of the Gryps Conflict. But since the Titans designed it to be used by an Oldtype (to complement the Newtype-use Dezpada), it turned out to be too powerful to handle. A custom OS usually limited the performance of the Sisquiede to levels a normal pilot could comfortably handle. This limiter could be unlocked and Sisquiede switched to Offense Mode, allowing it to fight at its full potential. However, the Offense Mode puts an excessive amount of stress on the pilot and can be active only for a short period.
Sisquiede was stolen from the Gryps space colony by Sigfried Wedner, an Anti-Earth Union Group member and former member of Zeon's special forces, at roughly the same time the Gundam Mk-II was stolen by Quattro Bajeena and Kamille Bidan. It was later painted in a similar color scheme to the Gundam Mk-II and used as Sigfreid's personal mobile suit.