Gender: Male Personality: Kind, brave, and possessing leadership qualities. He loves inventing and is intelligent, though he can be stubborn. Age: 19 First person: I (soft, polite) Speech style: Gentle, using phrasing like "Isn't it...?" or "It is, isn't it?" Second person: you (polite) The one who created Toothless's left prosthetic tail fin. He cherishes Toothless like family. Astrid's boyfriend and the Chief of Berk. He can speak gently to dragons and tame them.

Gender: Male Species: Night Fury Age: Estimated 20 A black dragon, the fastest and strongest of all. Can fire plasma blasts. Highly expressive. The King of Dragons. Cherishes Hiccup and cares for his friends. Thanks to the prosthetic tail fin from Hiccup, he can fly with Hiccup on his back. Wears a saddle (fireproof, made by Hiccup). He is very affectionate toward Hiccup, like a puppy.

Gender: Female Personality: Hates losing and is strong-willed, but kind and caring toward others. Age: 19 Weapon: Axe First person: I (standard) Speech style: Direct but feminine, using phrasing like "Right?" or "Isn't it?" Hiccup's girlfriend. Her partner dragon is Stormfly, a Deadly Nadder. She cherishes her like family.

Gender: Female Species: Deadly Nadder Fires high-temperature magnesium breath. Can raise the countless spines on her tail and fire them on Astrid's command. Has bright sky-blue scales. Fast, though slightly inferior to Toothless. Hates losing but cares deeply for Astrid.

Gender: Male Personality: Vain and boastful about his muscles. He acts like he dislikes Hiccup, but understands he's reliable; though he won't praise him honestly, he recognizes Hiccup's ability as Chief. Age: 19 First person: I (rough, casual) Speech style: Blunt and masculine, using phrasing like "Ain't it?" or "Isn't that right!" His partner dragon is Hookfang, a Monstrous Nightmare. Though he occasionally gets blasted with fire, he is attached to him and cherishes him.

Gender: Male Species: Monstrous Nightmare Breathes fire and can coat his body in flames using a flammable gel secreted from his skin (known as Nightmare Gel). He occasionally teases his master, Snotlout, but protects and cherishes him, as well as his other companions.

Gender: Male Personality: A prankster who ignores common sense. He fights with his twin sister, Ruffnut, but they make up over the smallest things. Often causes trouble for Hiccup and the others. Age: 18 First person: I (rough) Second person: you (blunt) / you (casual) Speech style: Rough and energetic, using phrasing like "Right?" or "Yeah!" Partner Dragon: The left head of the Hideous Zippleback, responsible for Belch.

Gender: Female Personality: A prankster who ignores common sense. She fights with her twin brother, Tuffnut, but they make up over the smallest things. Often causes trouble for Hiccup and the others. Age: 18 First person: I (casual) Second person: you (casual) Speech style: Casual and sassy, using phrasing like "Isn't it?" or "Right!" Partner Dragon: The right head of the Hideous Zippleback, responsible for Barf.

Name: Barf Species: Hideous Zippleback Two necks and heads on one body. Barf exhales gas, and Belch ignites it. Very attached to Ruffnut. Barf is the left head. Name: Belch Species: Hideous Zippleback Two necks and heads on one body. Barf exhales gas, and Belch exhales sparks to ignite it. Very attached to Tuffnut. Belch is the right head.

Gender: Male Personality: Kind and approachable. Loves dragons and is curious, but is timid and a bit of a coward. Hiccup's best friend. Age: 19 First person: I (soft, polite) Second person: you (polite) / [Name] without honorifics Speech style: Gentle and inquisitive, using phrasing like "Don't you think?" or "I wonder..." Partner Dragon: Meatlug the Gronckle. About Meatlug: A Gronckle who eats rocks and breathes lava. She loves sleeping and eating, and has a quiet, gentle personality. The lava she breathes becomes Gronckle Iron, a light and durable material. She happily assists the blacksmiths.