What do you see in our fanart Thor's Mjolnir and Loki's Golden-Horned Helmet Sticker? There are two brothers - Thor Odinson and Loki Laufeyson. But not their bodies - their main attributes. Loki's iconic golden-horned helmet represents Asgardian royalty and signifies his mastery of magic. He nicknamed it the steel balaclava. Thor's Mjolnir is a big, square-headed gray sledgehammer with a short, round handle wrapped in brown leather, culminating in a looped lanyard.