Giant Monsters and Magical Girls
Golems are machines that operate on magical energy of one form or another. Many run off the magic charge of a lacrima lodestone or other magic-charged material. Some run autonomously, doing simple jobs according to instruction, or designed to respond to a programmed situation (such as an intruder entering the room).
While most models operate with engineered interlocking parts, not all golems are mechanical, nor are they a recent advent either. Golemancy was lost for generations, but ancient texts mention people using elemental magic to give life to objects of carved Rock or ice. Still others exist that were formed by their makers of naturally occurring formations, like tar, crystal, and even manifestations of pure elemental energy like fire! These ‘wild’ golems are typically referred to as elementals.
(there’s a joke that G.O.L.E.M. is an acronym for “Genius-Operated Living Enchanted Manifestation”)