Chameleoman is a chameleon-themed robot belonging to the criminal organization BAD and serves as the primary antagonist in the fourth episode of Robot Keiji. Created to operate as a hired assassin, Chameleoman is loaned out by BAD to individuals seeking to commit difficult-to-trace murders, acting as a tool for their criminal ambitions. His design incorporates visual elements reminiscent of a chameleon, including large eyes and multicolored patterns on his face and arms, though his overall appearance is distinctly robotic rather than reptilian.

In terms of personality, Chameleoman is presented as a cold, efficient, and obedient weapon. He does not display independent motives or personal ambition beyond carrying out the assignments given to him by BAD and his temporary human employers. His sole motivation is the successful completion of his contract, in this case, the murder of a real estate company president’s in-laws in order to collect insurance money. He acts without hesitation or moral conflict, reflecting the typical function of BAD’s killer robots as disposable, specialized tools for crime.

His role in the story is that of a one-off villain who demonstrates the reach and versatility of BAD’s services. The episode centers on his use of a unique mimicry ability that allows him to approach and eliminate targets with the stealth of an invisible man. This ability requires the activation of a prism located on his forehead, which is a key weakness that the heroes can exploit. Chameleoman’s primary method of operation is to infiltrate secure locations by blending into his surroundings and then strike without warning, making him a particularly elusive and dangerous adversary for Robot Detective K.

Chameleoman’s key relationships are limited to his organizational superior, BAD, which commissions his services, and the human client who hires him. He has no meaningful personal connections and is treated as a functional asset rather than an individual. His development is nonexistent, as he appears only in a single episode and is destroyed by the end of it, leaving no lasting impact on the series’ overarching narrative.

His most notable ability is his chameleon-like camouflage, which enables him to become nearly invisible and approach his targets undetected. This power is activated by the prism on his forehead, and he uses it to commit murders that appear impossible or inexplicable to ordinary witnesses. Beyond this, he possesses standard combat capabilities typical of BAD’s robots, but no other exceptional powers are documented.