MISA AMANE SPOILER!
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Misa Amane is a popular model and actress who becomes the Second Kira after receiving a Death Note from the Shinigami Rem. Her parents were murdered, and Kira's killing of the man responsible turns her admiration for Kira into intense personal devotion. Misa trades half of her remaining lifespan for the Shinigami Eyes, allowing her to see a person's real name simply by looking at their face. That makes her enormously useful to Light and enormously vulnerable to him. Misa is energetic, impulsive and much less cautious than Light, but she is not powerless or unintelligent. Her willingness to sacrifice for him repeatedly changes the investigation, while Rem's determination to keep Misa alive becomes one of the few limits Light cannot ignore.
MISA THROUGH THE ARCHIVE //
DEATH NOTE OWNERSHIP LEDGER //
Open page →Gelus's Notebook Reaches Misa Through Rem
Open →Gelus Dies Saving Misa · Rem Delivers What He Leaves Behind
Gelus dies after using his Death Note to save Misa's life. Rem witnesses his death, takes the notebook he leaves behind and later gives that notebook to Misa. Misa therefore enters the story with a Death Note whose previous owner died specifically because he cared about her.
Why it matters
Misa's notebook is tied to protection before she ever writes in it. That history follows her into Rem's decisions and eventually into the notebook's later owners.
Misa's First Notebook · X-Kira's Real Weapon
The notebook that began with Gelus and passed through Rem to Misa eventually becomes the real Death Note used in Light's X-Kira arrangement with Teru Mikami. By this point the object has outlived Gelus, passed through Misa's ownership and become part of a plan built around keeping Light physically separated from Kira's killings.
Why it matters
The final trap is built around which notebook Near thinks Mikami has and where the real one is actually kept. The notebook's history matters because the endgame is an ownership and substitution puzzle as much as an identity puzzle.
