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Einherjar (pronounced "in-HAIR-e-yar"; singular einherji, pronounced "in-HAIR-yee") are great heroes who have died with bravery on Earth; soldiers in Odin's eternal army; they train in Valhalla for Ragnarök, when the bravest of them will join Odin against Loki and the giants in the battle at the end of the world. Einherjar live in Hotel Valhalla, where they train on a daily basis for Ragnarök. They don't age after they have been brought to Valhalla and cannot be permanently killed when they are in Valhalla, but they are resurrected a few hours after they are killed.
- Magnus Chase
- Mallory Keen
- Halfborn Gunderson
- Thomas Jefferson Jr.
- X (actually the god Odin in disguise)
- Lars Alhstrom
- Leif Erikson
- Alex Fierro
- According to some myths, Einherjar have a golden aura that can only be seen by valkyries.