This Funko POP! Animation figure captures Stain from Boku no Hero Academia in classic POP! style: oversized head, simplified features, and a dynamic stance. He wears a midnight-blue cloak that drapes over his lean frame, a stark white mask with menacing eye holes, and a dark bodysuit beneath. The cloak's fabric folds are stylized, giving the impression of motion as if caught in mid-step. In one hand, Stain wields a long, slender blade sheathed at his side, while the other hand rests in a ready pose. The paintwork emphasizes his stern expression and haunting presence, making him instantly recognizable to fans.

Stain, also known as Chizome Akaguro in the series, calls himself the hero killer. He travels the world in pursuit of what he calls true heroism, judging that many who wear the title hero have become profiteers or cowards. His moral code is brutal and uncompromising: those who use false acts of heroism to gain praise deserve punishment, and only a pure, selfless sense of justice deserves the title. He wields a blade and a calculated charisma, presenting himself as a guardian who will purge the industry of frauds. His encounters with other heroes reveal a dangerous philosophy that challenges the security of society and forces both heroes and villains to question what makes someone truly heroic. Despite his ruthless methods, Stain catalyzes growth in future generations of heroes and villains, leaving a lasting impact on the protagonist's understanding of power, sacrifice, and the meaning of true courage. In the anime and manga, his presence spurs debates about integrity in the hero system, inspires other characters to reevaluate their own ideals, and serves as a catalyst for significant plot developments as heroes confront the consequences of radical beliefs.