Dragon Initiation Test
Thuggory is among the Meathead Tribe boys who came to Berk to take part in the Dragon Initiation Test at the Thor'sday Thursday Festival. Thuggory, along with all the other trainees, were banished when they failed to control their dragons during an all-out dragon fight. Thuggory defends Hiccup when Snotface Snotlout blames him for their banishment.
The Green Death
Thuggory is also the first to go along with Hiccup's plan to deal with the Green Death, admonishing Snotlout for not even bothering to listen. Thuggory later attends Toothless' "funeral", when it appears he has died fighting the Green Death, only to witnesses Toothless' revival.
Fight Against the Red Rage Dragons
He joined the other Warriors-in-Training against the first strike of the Red Rage. After it was over, he was telling the others that Hiccup was surprising cool.
Joining the Dragonmarkers
Thuggory appeared near the end as the first to accept Valhallarama's new law that the Slavemark be changed to the Dragonmark, as a sign to those who chose Hiccup as the King of the Wilderwest.
When Thuggory is first introduced in Book 1, he is described as "a great hulking brute of a boy, who looked fifteen at least." He is larger than Snotlout at that juncture, and can easily shove him around.
Thuggory is both a brutish boy who can be very mean to others, but also readily admits his weaknesses. He is a bit righteous and not afraid to say what he means and stand up for what's right. He is also very good a Rudery - hurling insults.
- "Anybody who can have a twenty minute conversation with a winged shark the size of a planet and come out of it alive is a better thinker than I am."
- ―Thuggory to Snotlout about Hiccup