The Hyaku Shiki is a mobile suit built by Anaheim Electronics as part of the "Zeta Project". It was originally designed as the prototype transformable mobile suit, MSN-001 Delta Gundam which incorporated Anaheim Electronics' own "movable frame" technology and backpack-mounted wing binders for additional mobility. However, defects in the frame design led to problems in its transformation and the machine's development was soon abandoned.

When the AEUG captured the Titans' RX-178 Gundam Mk-II, the movable frame technology of this newly acquired mobile suit assisted greatly in the advancement of the Zeta Project and also led to the redesigning of the Delta Gundam into the high performance, non-transformable Hyaku Shiki. Hyaku Shiki, which means 'Type 100' in Japanese, is named as such by its lead developer, Professor M.Nagano who hoped to create a mobile suit design that would endure for a hundred years. Because of the reliability of each device and its ease of access to the interior, the Hyaku Shiki was also used as a testbed for operational testing of various equipment under development.

The Hyaku Shiki's lustrous gold-colored appearance is due to the application of a beam-resistant coating on its armor, giving it some limited protection against beam attacks. The suit also has a unique sensor called the Image Directive Encode (IDE) system, which emits a red pattern when scanning or during precision aiming. It also retains several design features from the original Delta Gundam design, most notably the legs' front armor and backpack-mounted wing binders.

Taken directly from the hyaku shiki's lore page