Iron Ball arms Sidero with a personal foundry: metal spheres take shape at his knuckles and fly at whatever he aims them toward. Introduced in World Heroes' Mission, the Quirk scales freely, producing shot no bigger than an egg or masses that dwarf the villain throwing them.
Rendered as Aian Bōru, Iron Ball is an Emitter Quirk with long-range reach, belonging to the villain Sidero. It appears in the third feature film, My Hero Academia: World Heroes' Mission, and originates there rather than in the manga.
Iron spheres form at the user's knuckles and launch from that point. Sidero decides how much metal goes into each one, and the range is considerable. A single ball may be no larger than an egg, or it may swell past the size of his own body.

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The ball Quirk in My Hero Academia belongs to Sidero, a villain who appears in the film My Hero Academia: World Heroes' Mission. His Quirk, Iron Ball, forms metal spheres at his knuckles that he launches at targets.
Iron Ball is Sidero's Quirk, which forms metal spheres at his knuckles and launches them at whatever he aims toward. He controls how much metal goes into each ball, so a single shot can be as small as an egg or larger than his own body.
Iron Ball is an Emitter Quirk with long range reach. It belongs to the villain Sidero and first appeared in the third My Hero Academia film, World Heroes' Mission.
Iron Ball debuts in My Hero Academia: World Heroes' Mission, the franchise's third feature film. It is a movie original Quirk with no appearance in the manga.
Sidero uses Iron Ball offensively, hurling metal spheres at his enemies from range. He also manufactures the spheres as ammunition that other people can put to use.
Looking for more on Iron Ball? The My Hero Academia Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the My Hero Academia anime series, manga, and official materials. My Hero Academia was created by Kohei Horikoshi, published by Shueisha, and animated by Bones. All rights to My Hero Academia and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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