Mildew

Mildew is a cantankerous old viking and a minor antagonist in the DreamWorks Dragons: Riders of Berk series. He lives in a small house on the outskirts of Berk, sharing it with a sheep named Fungus.

In How to Start a Dragon Academy, he was the most prolific of the Vikings to complain about the Dragons, pushing Stoick to cage or drive them away.

In Viking for Hire, he taunted Hiccup over the fact that his making peace with the dragons had cost Gobber his position as Weaponsmith.

Personality
Mildew is a consumate complainer; Gobber even said of his arrival "Here comes Mildew with the complaint of the day." It is implied that his house was built so far away from the village because of his abrasive personality.

Unlike most of the vikings on Berk, Mildew retained his hatred for the Dragons.