Vicious Twins

The Vicious Twins are a pair of characters mentioned in How to Train Your Dragon.

Biography
The Vicious Twins are considered an Elder amongst the Meathead and Hooligan Tribes, though it is unclear to which they belong.

"The Elders of the Tribes were Mogadon and Stoick, Gobber himself, and a few more of the more fearsome warriors, such as Terrible Tuffnut, the Vicious Twins, and the Hairy Scary Librarian from the Meathead Public Library"

- Book 1

As Elders, at a Thor'sday Thursday celebration when the Viking Initiates' dragon run amok, they were included in an Elder Huddle to decide their fate. Since the initiates failed to demonstrate control over their dragons, the Elder Huddle decided to exile all of them. During the huddle, the Twins had to break up a fight between Mogadon and Tuffnut:

"The Elders consulted for a long time. Mogadon got angry at one point and swung a fist a Tuffnut. A twin held on to each of his arms until he calmed down again."

- Book 1

Since the initiates failed to demonstrate control over their dragons, the Elder Huddle decided to exile all of them.

Physical Description
Nothing much is said about the Vicious Twins' physical appearances and personalities, or even if they are fraternal or identical twins. The only thing mentioned is that they are "fearsome warriors".