A "D-Class Hero" is a term used in the fictional universe of One Punch Man, referring to heroes who are considered the lowest rank in the hero classification system. These heroes often lack significant powers or skills, making them less effective in combat against villains. Despite their low status, they still strive to protect the public and uphold justice. D-Class Heroes typically take on minor threats and everyday problems, such as rescuing cats or dealing with petty criminals. Their efforts, while often overlooked, contribute to the overall safety of society. Many D-Class Heroes aspire to rise in rank and prove their worth in the hero community.