Tuffnut Thorston / Biography

How to Train Your Dragon
Joining the same Dragon Training class as Hiccup, at first Tuff delights in taunting Hiccup over his poor performance although he doesn't have much success either due to the fact that he couldn't get along with his sister in battle. Later, however, when Hiccup displays an amazing talent for subduing the Dragons, he becomes his avid fan (often pushing and shoving Ruff to be the first to talk to him). The twins decide to help Hiccup fight the Red Death and bond with the Zippleback that had been trapped in the training arena before.

To confront the Red Death, the twins mount a Hideous Zippleback, which fits their fractious relationship, the two naming the dragon Barf and Belch. Each head seems to agree with one of the twins in particular - Ruff taking Barf and Tuff Belch, and they ride it to great effect in the final battle and afterwards. Notably, they were the only ones not forced from their dragon in the final battle.

How to Start a Dragon Academy
Tuff is a Dragon Trainer of the Berk Dragon Training Academy, joining to help Hiccup train dragons.

Twinsanity
He experienced a brief falling-out with his sister when their conflict reaches the point where they attempt to issue separate orders to each head, Tuff in particular noting that he was tired of the two of them always sharing the same things, but eventually reconciled when Barf and Belch were in trouble, accepting that they would always share their Dragon even if they could find other individual interests.

Gem of a Different Color
Tuffnut then traded something to Snotlout for a stone of good fortune, which was actually a Changewing dragon egg. Tuffnut then tried to demonstrate it's good luck by jumping into a garbage pit filled with Fireworms. However he was saved by Astrid. Tuffnut then spotted a Changewing. He then came under attack by an angry Changewing who wanted it's egg back. Following the Changewings' attack, Tuffnut attempted to train one but was unable to actually find one again.

Zippleback Down
Tuffnut has a more prominent role when the team attempts to disable traps that were left over from the time that they killed Dragons. After bonding with Torch, he teaches him some basic hand-signals and officially training him. Hiccup then goes to find them, only to be thrown down when Toothless' prosthetic tail was burnt off. When a forest fire appears, Hiccup almost decides that it's too late, but Ruff and Tuff figure out a way to keep the fire away from Berk by "fighting fire with fire". They returned to Berk, riding on Torch, where he leaves after saying good-bye to Tuff. Despite their amazing feat, the twins are to have learned a lesson by releasing themselves from the trap without help. Despite their combined efforts, both of them end up being trapped again.

A View to a Skrill, Part 1
Tuffnut again has a prominent role. The twins and Snotlout were the prime cause in the release of the Skrill and they help Hiccup and the gang to tame it. After splitting up into two groups, the twins attempt to drive out the Skrill by causing a big explosion by Barf's gas and Belch's spark, but the plan fails. After saving Hiccup from the Skrill, they're chased by the Skrill and Hiccup and Toothless narrowly make it to block the blast of lightning with a plasma blast. The explosion was so great, it knocks the twins out of the sky and away from the group. They land on an outcrop of land and spot Alvin capturing the Skrill. They decide to follow the ship. Meanwhile, their disappearance causes the other Viking Teens to search for them, leaving all dragons but Toothless too exhausted to fly.

A View to a Skrill, Part 2
Hiccup goes to find them and meets up with them on Outcast Island, where they were spying on the Outcasts. Tuff goes undercover to find out about the Berserkers' and the Outcasts' apparent truce. He then helps Hiccup to find the Skrill, but it was too late as Dagur managed to get to it first. After Hiccup duels with Dagur as well as the Skrill (after it's been freed), the twins help seal the hole and encase the Skrill in ice once again. After the chaos had ended, the twins and Hiccup return home to Berk.

The Eel Effect
Ruffnut is shown to be slightly more clever than Tuffnut when she convinced him to slap herself by saying that it would hurt him too (since they're twins), clearly just saying that because she enjoyed watching Tuff hurt himself.

Frozen
As well as this, Ruff also manages to convince Tuff that he has a tail, and can be stung by the Speed Stingers on said tail, enjoying watching him believe he was paralyzed.

Dragons: Race to the Edge
Three years after the end of the war with the Berserkers,Tuff, along with his sister, then started to worship Loki.

Dragon Eye of the Beholder, Part 1
Together with their dragon, they pranked everyone on Berk until they inadvertently found Trader Johann adrift. They went with Hiccup to search for Dagur the Deranged at the Ship Graveyard.

When Darkness Falls
Tuff and his chicken then discovered the Night Terrors on Dragon's Edge. Tuff also named the alpha night terror, Smidvarg.

Bad Moon Rising
Tuffnutt then believed that he was bitten by the Lycanwing and turning into one. However, it was discovered by Snotlout that he was bitten by wolf actually.

Snotlout Gets the Axe
Tuff also trained with Berk's officiator in how to perform weddings. However he was unable to complete his training when the officiator fell of a cliff. Tuff also inadvertently married Ruff to Fishlegs when revealed that he trained with Berk's officiator.

The Zippleback Experience
Tuff and Ruff then tried to put Hiccup in danger in order to get their dragon back from it's life debt to Hiccup. They were successful in rescuing Barf, Belch and Hiccup from Ryker and Dagur.

Edge of Disaster, Part 1
Tuff then assisted Astrid in defending the Edge against Ryker's and Dagur's men. Tuff then fought Ryker head on until He and Dagur's men retreated when Hiccup brought in reinforcements.

Shock and Awe
Tuff and his sister then celebrated Loki Day by playing pranks everyone. However, at the end of the day, Tuff's hut was then moved by Astrid and Stormfly.

Season 4
Defenders of the Wing, Part 2

Gruff Around the Edges

Midnight Scrum

Not Lout

Saving Shattermaster

Dire Straits

The Longest Day

Gold Rush

Out of the Frying Pan

Twintuition

Blindsided

Shell Shocked, Part 1

Shell Shocked, Part 2

Dawn of the Dragon Racers
Tuff then helped Hiccup and the other riders round up Silent Sven's sheep. Following that Tuff then established the basics of Dragon Racing. Tuff and Ruff then joined Snotlout on his team Snoutnut. During the official first race, Tuff and Ruff then tried to cheat by painting a sheep black and lost to Hiccups and Fishleg's team Hiclegs.

A couple of years later before the second film, Tuff then worked on improving his face paint.

How to Train Your Dragon 2
In the second film, Tuff would not let his dragon be taken by Drago Bludvist. Tuff was disgusted by his sister's attraction to the Dragon trapper Eret. Following Stoick's death, Tuff rode one of the baby Scuttleclaws despite difficulty in riding them back to Berk.