The Hyaku Shiki Kai is an improved variant of the MSN-00100 Hyaku Shiki. Modifications include improved flexible wing binders and more powerful thrusters. It also features grenade launchers built into the forearms and optional shoulder-mounted weapons such as a beam Gatling gun and pulse laser gun.
Developed from the Hyaku Shiki by Anaheim Electronics, the MSR-100 (MSR-00100) Hyaku Shiki Kai (also called MSR-100S (MSR-00100S) Hyaku Shiki Kai) served as a base unit for further mobile suit developments. While it's unclear how many Hyaku Shiki Kai were produced, there are several variations of the machine. In the Mobile Suit Gundam Char's Return (1998) game book, one Hyaku Shiki Kai unit was assigned to the Londo Bell flagship Nahel Argama in UC 0090.