Agoni (アゴーニ, Agōni) is a multi-millionaire and the founder of the Hero Association. He came up with the idea when his grandson was saved from a Mysterious Being by a passerby 3 years prior to the events of One-Punch Man. He has yet to make a physical appearance in the story.
Agoni is largely characterized by his enormous cleft chin. He is an older looking man with a wide nose, large mustache, and bushy eyebrows. His hair is straight, brown, and parted on the left. He dresses in a formal business suit.
Agoni's grandson jokingly vandalized the shell of Crablante, a Mysterious Being, which made him the target of the being's slaughter. He was saved, however, by Saitama, a passerby stranger. Agoni was so moved by this that he created the Hero Association and the National Superhero Registry to create and manage superheroes like Saitama, who would protect humanity against the Mysterious Beings.
Agoni appears in a booklet Saitama was given after successfully registering as a hero.