Being made of pixels, they're weightless. When it's convenient. For example, they can stand on weak furniture without it breaking, or balance on a teeter-totter without tipping it. But they won't get blown over in strong wind. Usually they toggle their weightlessness on and off, sometimes it's easy to carry them and other times... not so much. How? Magic...?  

((A/N: Happy Halloween my fellow creeps! What're y'all going as? I'm going as Dark Link. Be sure to stay safe out there! You wouldn't want Jeff to find you!))