Quad Arms gives Fourth Kind a second pair of arms, and that is the entire trick. For a Pro Hero whose specialty is fighting up close, four fists beat two, and four hands carry a great deal more than two ever could.
Quad Arms is a Mutant Quirk with close range, belonging to the Pro Hero Fourth Kind. It appears in Chapter 48 and in Episode 27, with the volume 6 omake confirming the particulars. The sum total of the ability is one extra set of arms on the user's body.
Nothing has to be switched on, since the additional limbs are simply part of Fourth Kind. In practice they let him juggle several objects simultaneously and hand him a real edge in the hand-to-hand combat he specializes in.
Fourth Kind is the known holder. Extra Arms is identical in effect. Two others sit nearby: Body Morph, and Playtime, which comes out of My Hero Academia: Vigilantes and has only ever been seen while its user is dosed on Trigger.
Quad Arms is a Mutant Quirk belonging to the Pro Hero Fourth Kind that gives him a second pair of arms, permanently present on his body.
The extra pair of arms lets Fourth Kind juggle several objects simultaneously and gives him a real advantage in the close-quarters hand-to-hand combat he specializes in.
No. Quad Arms requires no activation since the additional limbs are simply a permanent part of Fourth Kind's body.
Yes. Extra Arms is identical in effect to Quad Arms.
Quad Arms first appeared in Chapter 48 of the manga and Episode 27 of the anime, with further details confirmed in the volume 6 omake.
Looking for more on Quad Arms? The My Hero Academia Wiki on Fandom has a dedicated page with community notes.
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