Hmm, looks like there's this story that is in my work in progress, called, Azur Lane: The Two Rivals. This story is centered around two giant robots, two different sides of the same coin. The Main protagonist is Tempest, a samurai robot that transforms into the lead ship of the Yamato-class super battleships, IJN Yamato, and then, the main antagonist of this story is Shellshock, a skull faced robot with a alt form of the Schwerer Gustav railway artillery gun. Currently as of now, this story is a work in progress, thank you very much!