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Oh wow, I had a feeling that was the case as well, since her power is from blood drain, she can use other people's quirks.
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Also I do like the fact that King wants to get stronger to show that he's not a complete joke of a hero for taking Saitama's credit. But with things narrowing down to the wire, a bunch of heroes are calling it quits or taking backseat roles to those that can fight these threats on a stable basis.