Amane, also known as Laevateinn, manifests the legendary Norse sword once said to set the world ablaze. Originating from Muspelheim, she wields Killium born from the Laevateinn blade's destructive power. This link to immense power clashes with her core identity as a self-proclaimed rootless wanderer actively avoiding commitments or deep connections. She exhibits pronounced laziness, preferring distant observation over direct engagement, particularly amused by watching busy people. Napping is her favored pastime, reinforcing her detached nature.

Fragmented memories haunt her, dominated by an image of a brilliant rooster atop the World Tree. Mythology claims her sword is the only thing capable of slaying this creature, yet she retains no memory of the act. This absence fuels a persistent obsession with the bird and manifests as an unexplained aversion to chicken. Deep within, she believes defeating this rooster could erase her traumatic memories of world destruction, potentially freeing her from solitude and emotional detachment. Beneath her outwardly aloof demeanor lies a fundamental loneliness she struggles to acknowledge.

Her character unfolds gradually, especially through persistent interactions with Vanargand. His efforts slowly erode her emotional defenses, exposing a buried longing for companionship and a fierce, previously unacknowledged desire to protect comrades, marking a shift from her initial isolation. Visually, her design reflects her weapon origin and military undertones, often featuring jackets with distinct threading patterns.

A distinct male counterpart also embodies the Laevateinn sword's power. Sharing the same Muspelheim origin and birthdate, he diverges sharply in personality. He embodies cynicism and nihilism, viewing tangible things as worthless and actively despising anything deemed pointless. Trusting only himself, he rejects leaders and comrades, influenced by his Prime version, codename Zero, the first Killer Prince. His demeanor is wicked, temperamental, and cunning, drawing parallels to the Norse trickster god Loki associated with the blade. He exhibits a strong aversion to emotional provocation, interpreting such responses as profound weaknesses.

His development subtly contradicts his professed ideology. Despite claims of self-reliance, he demonstrably opens his heart to Valyn and the commander, willingly cooperating with comrades. This observable change becomes apparent to others, though his prickly nature discourages direct commentary on the contradiction. Visually, he shares design cues like jacket threading and shoe color with his female counterpart, but incorporates heavier, lock or key-like metallic elements into his attire, symbolizing the mythical blade's imprisonment. Both versions ultimately demonstrate a capacity for growth beyond their initial isolation or nihilism, revealing complex inner needs beneath formidable exteriors.

The legendary sword Laevateinn itself, the source of their existence, carries immense destructive lore within Norse mythology. Forged by Loki, it was capable of killing the rooster Víðópnir on the World Tree. This mythology directly informs the characters' backstories and their connection to world-scarring events.