Krogan

Krogan is a member of Drago Bludvist's army and a bounty hunter who attended Viggo Grimborn's Dragon Auction.

Last Auction Heroes
Krogan is sent to buy dragons from the Dragon Hunters's Chieftain Viggo Grimborn's Dragon Auction. He tried to buy Hiccup's Night Fury, Toothless. However, he flees without the Night Fury when Berk's dragon riders caused a panic by freeing the auction's dragons.

Midnight Scrum
Krogan appears again, where he knocks out Throk with a dart after a difficult fight and captures Hiccup in an attempt to get the bounty on him placed by Viggo Grimborn. But upon bringing Hiccup to Ryker Grimborn, he is betrayed and ambushed by several Dragon Hunters, whom he manages to defeat. Later, Krogan attacks Hiccup, who had escaped during the ambush, stating that he would take him to Viggo himself to get the bounty. During their fight, Hiccup removes his mask and recognizes him as the same man who attempted to buy Toothless at Viggo's Dragon Auction, much to Hiccup's anger. Eventually, they both end up hanging at the end of a cliff, Krogan grabs onto Hiccup's prosthetic leg and tells Hiccup to drag him up. However, much to his shock, Hiccup, still angry at him for attempting to buy Toothless, instead removes his prosthetic leg and sends Krogan falling below to his apparent death.

After the Dragon Riders rescue Hiccup, Ryker attempts to throw a dagger at him, only for Krogan, who is revealed to have survived his fall, to knock him out with Hiccup's removed prosthetic leg. Realizing that he is outnumbered, Krogan jumps from the edge of the cliff and escapes without a trace.

Abilities, Skills and Talents
Combat: Krogan is a highly skilled combatant, able to use his axe and fists to fight and defeat Throk and multiple Dragon Hunters. He also uses a long chain to capture and restrain Hiccup.

Trivia

 * Krogan is the first of Hiccup's human enemies that he attempted to kill on purpose.
 * He is also the first character in the TV series that works for a villain introduced in the films, Drago Bludvist.