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.
Grimmel serves as the primary antagonist, directly threatening Hiccup and his dragons.
Astrid faces direct opposition from Grimmel's hunting army.
Valka's protective instincts directly clash with Grimmel's predatory goals.
Ruffnut actively provokes Grimmel during her captivity, creating a tense dynamic.