Torch

Torch is a baby Typhoomerang introduced in the Riders of Berk episode The Terrible Twos. 

He's discovered in the woods by Hiccup and Toothless with an injured left leg and seemingly orphaned. In reality, though, Torch has two siblings and a mother who were all frantically looking for him.

Torch seems to have a rebellious side, willingly going with Hiccup despite knowing his mother would worry, and continuing to follow him even when his mother is trying to get him back. Torch also seems to enjoy messing with Toothless, frequently acting like a spoiled brat towards him, but making sure he did so when Hiccup wasn't looking.

Despite Torch's bratty ways, he does seems to genuinely enjoy Hiccup's company, but ultimately wants him all to himself.