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Neito Monoma couldn't use Eri's Quirk, because it is not compatible with his own Quirk.
Although Neito Monoma can indeed copy any Quirk, he only copies them in their "base" state. We could say Neito Monoma obtains the Quirk as if he was a baby and the Quirk manifested for the first time.
When Neito Monoma tried to copy Deku's Quirk, he found himself devoid ...
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Yes, the other successor's for One-For-All where handpicked by the previous users among the most fit to use the quirk. Gran Torino mentions that even though Toshinori/All-Might was born quirkless, he possessed great resilience and endurance to maintain One-For-All power.
Midoryia had no previous training nor did he had good constitution or muscle strength ...
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If you missed it on theaters, the Blu-ray and DVD is releasing on July 15, according to the film's official twitter account.
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