I feel an urge to talk about our first giant robot, and how "he" fits into the game.
Unit One (they never quite came up with a better name/designation for it) comes in at about 30 ft (9 meters) and nearly forty tons. This puts it in the range of most Type A and Type B Beasts. Fully humanoid, it is covered in layered RHA armor (with later upgrades to a Chobham composite armor on the torso, head, upper arms and upper legs area), with a central cockpit in the rear chest area, mated to a zero/zero ejection seat. The cockpit and design gives the Unit One a distinct "humpback" look.
Unit One uses a combination of hydraulics and linear motors for control and movement. The A/O generator is located just below the cockpit and must be activated for Unit One to even stand up, let along move. Nuclear power was rejected for obvious reasons (Unit One engages enemies in close combat), but the battery power system has a limit of six minutes at full combat power, ten minutes at "standby" walking speed.
All versions of Unit One were built by Tojo Heavy Industries in Japan, and were shipped to various locations along the Ring of Fire to defend against attacks, with the exception of (then) Soviet territory. Twenty-two Unit Ones were built, the first on March 11, 1968 and the last on June 19, 1968.
The Mod One version of Unit One added upgrades to the computers and added newer linear motor arrays to the hands in the mid-70s. The Mod Two version replaced the torso, head, upper arm, and upper leg armor with lighter but equivalent Chobham armor plates, and revamped the control and monitor system in the late-80s. No further modifications were to be made, and there was serious talk about retiring Unit One until the Second Great Monster War.
Unit One, initially, relies upon a 30mm "rifle" and it's reinforced fists for combat. To use the rifle or to engage in combat with Beasts, Unit One needs to "erode" the A/O field of an enemy Beast, enough to engage it in combat.
While old and somewhat decrepit...it would form the first line of defense when the Beasts came back. And, it can be upgraded and the basis of the design is one of future giant robots...