The quirk that All Might possesses is called All For One. It is a quirk that can be passed from one person to another and it gains more power each time it is passed. All Might gave Deku (Izuku) a sliver of his power by making him eat one of his hairs. If this is how it can be passed than isn't possible for that quirk to be passed to a multitude of people? Say, an army, for example.
2 Answers
All Might himself said:
After I've given Izuku my hair/DNA, I've gotten a lot weaker
So it would either be a one time thing, or every new user would weaken him substantially so it would still be a small number, and probably of lesser effect.
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I recall that line being a little ambiguous, though. It's likely that passing Deku his power has weakened him, but it could also just have been the progression of his existing degeneration.– ConManJan 15, 2017 at 23:29
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I think he said that after he did it, his strength went down fast, so I made that connection, of course it could also be unrelated. Do we have a way to know?– RnRogerJan 16, 2017 at 1:35
I think yes, all might was already getting weaker as it is but could still give his power off. in the show it made it seem as if 2 people cold hold the quirk at the same time as shown with izuku and all might as there time overlapped. so possibly if we tried passing the quirk among to 2 people it could possibly work.