Dede is an einherji that joined Valhalla at the same time Magnus Chase did. She is predicted to become a Thane within a hundred years.
History
Dede saved a bunch of kids at her village school when a warlord's soldiers had tried to kidnap them. She'd flirted with one of the soldiers, tricked him into letting her hold his assault rifle, then turned it on the warlord's men. She was killed, but her selfless act gave the other kids time to get away.
Magnus Chase and the Gods of Asgard
The Sword of Summer
The Vikings loved her pretty violent video. Dede got a standing ovation. The Vala read the runes. She confirmed that Dede's parents were regular mortals, but nobody seemed to mind that. According to Dede's fortune, she would fight valiantly at Ragnarok. Over the next week, she would lose her arms several times in combat. Within a hundred years she would rise to the thanes' table. At this, "Oooooo!" the crowd murmured appreciatively.