Infamous dragon hunter and antagonist who nearly destroys the Night Fury population. He attacks Berk, traps the riders, captures Toothless and the Light Fury, and exploits Toothless's alpha status to threaten the dragons. He is defeated by Hiccup and Toothless before falling into the ocean.
Hiccup's effort to protect dragons directly opposes Grimmel's hunting campaign.
Grimmel attacks Berk, captures dragons, traps the riders, and battles Hiccup during the rescue mission.
Their encounter shows Grimmel's control over the riders and Ruffnut's defiant behavior.
Grimmel captures Ruffnut after the riders fall into his trap, but releases her after she irritates him.
Valka and Grimmel stand on opposing sides of the campaign over dragon safety.
Valka detects Grimmel's army, while Grimmel leads the forces threatening the Berkians and their dragons.