Halfborn Gunderson

Halfborn Gunderson is Magnus Chase's hall mate. He helps Chase on a few occasions, including the fight against Surt and Fenris. He died in the Viking invasion of New Anglia, England. He has been at the Hotel Valhalla for 1,200 years.

History
After his death and before Magnus Chase's arrival at Valhalla, Halfborn has visited five of the Nice Worlds, including Midgard, Alfheim, Nidavellir, and Jotunheim.

Appearance
According to Magnus in The Sword of Summer, Halfborn looks like "Robinson Crusoe on steroids" - with his shirt being a patchwork of animal pelts, his hide pants in tatters, and his beard being wild even by Viking standards.

Abilities

 * Pain Tolerance: It is stated that Halfborn is a berserker, oblivious to pain, with it being claimed that he would fight until "he is literally hacked to pieces."
 * Language Skills: Halfborn has learned 12 different languages over his time in Valhalla.
 * Knitting Skills: Halfborn has learned how to knit over his time in Valhalla.