The protagonist of the novel mech category has a body-refining humanoid armor This kind of plot was more common. It usually involved the protagonist improving his physical fitness through physical training and other means so that he could equip himself with more powerful mecha for battle. The humanoid armor was designed to increase the defense of the protagonist's mech, allowing the mech to better protect itself and the protagonist from attacks. In novels, the protagonist would usually go through a series of challenges and tests in order to obtain more powerful mecha and body-refining skills to win in battle. This kind of plot could also be used as one of the main topics of the novel to explore the relationship between humans and technology, as well as the transformation and influence of body refinement and mecha on the human body.