The Hairy Scary Librarian is the librarian of the Meathead Public Library. He is an old man with a beard so long he could wipe his feet with it, and so it is usually tucked into his belt. He also owns a small arsenal of weapons, including Heart-Slicers, swords, axes, and a Northbow. His grammar is not that good either. He is a skilled swordsman due to being a Flash master, who are said to be almost impossible to beat.
How to Train Your Dragon
In How to Train Your Dragon, the Hairy Scary Libarian is an Elder, and Gobber stole a guide from under his nose. However, the book only contained one page. Stoick the Vast wrote a letter to the author complaining that it needed more words at the end of the book. Gobber also mocked him for being such a lousy guardian.
How To Twist a Dragon's Tale
In this book, the Hairy Scary Librarian is the referee of the competitions at the Thing.
A Hero's Guide to Deadly Dragons
The Hairy Scary Librarian is the librarian of the library, full of banished books, in A Hero's Guide to Deadly Dragons. He was famous for using his Heartslicers to cut anyone who was caught in his Library. He fought Hiccup and Camicazi in a sword fighting duel. Fishlegs whacked him with a book of Swordfighting with Style, causing the Librarian to fall in a group of Red Hot Itchyworms. He flees, laughing hysterically and is not seen again until the end of the book. At the end of the book ,he threatens to shoot Stoick the Vast and Big-Boobied Bertha with a Northbow arrow. He fires, but the arrow only hit a book Stoick was carrying, Hiccup's Stealth Dragon squashed the Librarian flat. The Murderous Tribe is tricked that he stole their Stealth Dragon. He is taken to the Uglithug Slavelands, and Madguts the Murderous took his Heartslicers when he captured him.
the hairy scary librarian may know a little dragonese due to the fact that he speaks a few words in dragonese (example "grubwasher")