The heroic world in One Punch Man is populated by many heroes, and also by some interesting, complex characters whose motives are not very clear. There is more and more such ambiguity within the Hero Association because it institutionalizes the heroic world, the classic distinction associated with good and evil among them being available for a much wider range of interpretation.
Huge amounts of money or unparalleled intelligence are used to bring forth social goods for humanity, but their approach or lack of transparency has been unethical, as per moral judgments. Such characters throw traditional definitions of heroism out of joint for other characters and for the audience to think afresh about whether power has ever been used fairly.
Metal Knight, also known as Dr. Bofoi, goes with the discourse of moral ambiguity heightened in One Punch Man, touted officially as an S-Class hero. Despite this, most other supposed heroes, like Genos and Drive Knight, look at him suspiciously. His activities are usually animated by powerful, remote-controlled machines, characterized by disconnection and disclosure of no clear allegiance. Not necessarily evil, the character runs on self-interest and secrecy, making it difficult to say whether it is an ally or an enemy.

Metal Knight is shown to be a very successful member of the Hero Association who often provides equipment and infrastructure, such as fortifications and defense systems. However, his refusal to directly engage in battle and his habit of collecting information through destruction suggest that his motives are not necessarily grounded in the morals of classical heroism. He views conflict as an opportunity to strategically test and perfect his technology rather than in human loss.
Drive Knight, another technologically equipped hero, pronounces one of the strongest charges against Metal Knight, warning Genos that Metal Knight is his "enemy." Although the manga and anime, as of that point, do not provide any substantial proof, this warning casts a dire shadow on Dr. Bofoi's possible intentions. Drive Knight's credibility and Bofoi's reclusive and utility-based character keep much of the audience wondering whether Metal Knight belongs to the Hero Association or just his ambitions.

Metal Knight's contributions to society are inescapable, and they feel transactional-based. His city rebuilding and weapon systems development appear twofold in motive: it's for the common good and an opportunity to spy on or test his constructs in the wild. Such a practical attitude might rub the wrong way, particularly when set upon a world with characters like Saitama or Mumen Rider, who are such ideal definitions of selflessness.
Metal Knight’s Role in the One Punch Man Manga’s Final Developments
In the evolution of One Punch Man's manga, Metal Knight plays a more and more important role. Although he isn't fighting among the first lines, his hold over military-grade hardware and information-network technologies causes him to have a much-advised affect on the state of power in the world; thus, in the post-Monster Association arcs, particular attention is directed toward his actions and responses due to the undeniable fact that his suspicions about Drive Knight have yet to be cleared.

There, with the insistence of some panels, the One Punch Man manga barely has anything to settle: is Dr. Bofoi a traitor or merely a cold-blooded pragmatist? His survey of technological expansions appears to be beyond being monitored by the Hero Association. If this continues, he becomes that wildcard whose strength and brilliance may either redeem society or destroy it, depending on the types of threats he perceives.
One Punch Man's anime adaptation has yet to address the riveting drama concerning Metal Knight. Seasons 1 and 2 introduce his character; however, they feature external threats greater than the internal struggles he may face one day. It is only in potential future episodes or adaptations that the tension between this character and Drive Knight further develops, determining whether that warning was bred from rivalry or genuine concern.
Without any clear conclusions, Metal Knight is a very interesting specimen of danger under control. His unsentimental take on heroism makes him one of the most enigmatic figures of One Punch Man. He is neither good nor evil, but his free rein and secretive methods make him a possible threat whose alignment may only be shown when it is too late.
Thus, there is a sense of uneasiness in his behavior and motivation in One Punch Man. He is not overtly evil, like the stereotype. Whether he ultimately helps or harms the Hero Association is still one of the best unresolved mysteries of the series. As the manga and anime move forward, fans of Dr. Bofoi will likely be looking to see which side of the moral line he chooses to stand on.