Mecha (メカ?) is a term commonly used to refer to giant or otherwise very large robots. It can also act as a shortened version of the English word "mechanical" or "machine". "Mecha" may also refer to a mechanical organism. Meka
Although they are mostly described as robots, mechas can incorporate some organic elements, as is sometimes the case in the Godzilla series. Such mechas are often referred to as "cyborgs." Two primary examples of cyborgs in the Godzilla series are Kiryu and Mecha-King Ghidorah, both of which are created from a combination of kaiju and mechanical parts.
Most mechas in the Godzilla series and beyond are armed with an inconciveable amount of firepower. A prime example is the original MechaGodzilla, having toe, knee and finger missiles, an electric beam from his chest, twin laser beams from his eyes and a shield generator.
Many mechas are remotely controlled by an exterior force. The original MechaGodzilla was controlled by the Black Hole Planet 3 Aliens, Mecha-King Ghidorah was piloted by Emmy Kano, the Heisei MechaGodzilla was piloted by a crew of humans, as was M.O.G.U.E.R.A. Kiryu was, for the most part, under human control, either remotely or directly when piloted by Akane Yashiro. Kiryu however was able to act autonomously when the first Godzilla's spirit took control of it.