Kiryu is the version of Mechagodzilla introduced in Godzilla Against Mechagodzilla in 2002, returning the following year in Godzilla: Tokyo S.O.S. Unlike earlier mechanical Godzillas, Kiryu was built around the skeleton of the original 1954 Godzilla, giving the machine a living core and a roar that blends organic and mechanical sounds. Clips of that roar circulate in kaiju fan edits, reaction videos and soundboards, where fans use it to signal a mechanised Godzilla rather than the classic monster, keeping the Millennium-era design recognisable to new audiences.