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- Ambiguous Disorder: Given her numerous tics, social awkwardness, and problems concentrating, one may suspect that Erin is mildly autistic or has AS.
- Anti-Hero: Type I.
- Beast and Beauty: The Beauty to L's Beast. They are of course both human, but you can see shades of this dynamic in their personalities and interactions. She's warm, friendly and merciful, while he's cold, strange, and ruthless.
- Belligerent Sexual Tension: With L.
- Break the Cutie: It starts with being put under house arrest by L. As she gets involved in the investigation, she comes face to face with people who are willing to kill over profit, spirits who are capable of snuffing out humans with a name and a face, and two people she came to consider her friends proving less than stellar as she thought they were. She gets better, but not after some therapy when everything's said and done.
- First-Person Peripheral Narrator: She narrates the entirety of the story.
- Fish out of Water: She's an American whose initial grasp of the Japanese language is passable at best, and she constantly questions her own decision to go to Japan for her studies. It gets worse when she makes contact with L and gets involved in the Kira investigation.
- Hot-Blooded: Erin's emotions often get the best of her. She even mentions (in a lame excuse for running a fever) that she has "a feverish personality."
- Morality Pet: Becomes one for L. He definitely treats her better than he treats Light or Misa even when he takes her into custody...but that doesn't keep her totally safe from his dirty play.
- Naïve Everygirl: Downplayed. She likes to sound and act worldly, but she is really fairly innocent and deeply insecure, and is prone to being self-absorbed. Even so, she always has her heart in the right place, and she becomes more contemplative and insightful as the story goes on.
- Nice Girl: Hot-Blooded nature aside, she's one of the sweetest and most moral characters in the fic, though she does have limits.
- Stepford Snarker: Uses snark to cover up how scared, insecure and naive she actually is.
- Tsundere: Vacillates between both types. With L, she's Type A (prickly and argumentative initially, with her softer side appearing later). With most everyone else, she's Type B (awkwardly friendly but does have a short and hot temper).
- Wrong Genre Savvy
- Anti-Hero: Type IV.
- Big Good: Taken apart, especially by the end.
- Fatal Flaw: He's hell-bent on exposing Kira and bringing him to justice, whatever the cost. He succeeds but destroys his standing with his peers in the process due to the means he takes to do it, and ends up Dying Alone.
- Sugar-and-Ice Personality: Typically aloof, logical and arrogant, and can be petty and cruel. But he occasionally does flash a softer side, from handing Erin a box of tissues when she starts crying, to expressing lingering regret for Ukita's murder prior to the events of this story, to performing a Heroic Sacrifice to stop Light.
- Your Days Are Numbered: He uses the Death Note on himself to outwit Kira. It works but he's left with a month to live, and by the time of the epilogue, he's left this life.
- Fanboy: Of Misa Amane. After The Reveal, he likely doesn't stay that way.
- The Friend Nobody Likes: Downplayed. None of the task force particularly dislike Matsuda, but his apparent naivety, incompetence, and wishy-washiness about Kiras morality makes everyone look down on him.
- Like Brother and Sister: He and Erin become True Companions over the course of the story, and the two come to care about one another as Platonic Life-Partners.
- Nice Guy: Unequivocally. He and Erin get along really well because of his goofy charm, and he makes a tremendous effort to make her stay in Japan and at headquarters as comfortable as he's able. In the epilogue, the two are Like Brother and Sister, and keep in touch long after the end of the case.
- Bitch in Sheep's Clothing: Light spends much of the fic being accommodating towards L, and trying to encourage him to act more ethically. Once the Amnesiac Dissonance wears off, and he's convinced he's got nothing to lose, he revels in his monumentally murderous megalomania.
- Broken Pedestal: Light is Socihiro Yagami's son, one of the top students in Japan, and L's primary suspect in the Kira Investigation. Erin and the task force take turns defending him from L, as they're all convinced he couldn't be Kira. Consequently, everyone is very unhappy when Light is exposed, with Soichiro taking it the hardest.
- False Friend
- Foil: Traditionally handsome, social, courteous, moralhe's L's opposite in many ways, despite their apparent shared goal of bringing down Kira.
- False Friend
- The Fashionista: She is a model and actress, after all.
- Foil: To Erin. Misa is the more traditionally feminine of the two but also the more confident and socially adept. In addition, she defers almost entirely to Light's whims whereas Erin puts up much more resistance when she has a problem with L. The degree to which Misa obeys Light is more disturbing than even Erin first finds it...
- Odd Friendship: With Erin.
- Perky Goth
- Psycho Supporter
- Savvy Guy, Energetic Girl: The Energetic Girl to Light's Savvy Guy.
- Shipper on Deck: Insists on putting L and Erin together every chance she can. However, it's implied that her reasons for doing so are more selfish than anything else (namely, to distract L and get Light more to herself).
- Yandere: For Light. Do not mess with him in front of her lest you provoke her murderous wrath.
The Big Bad. A Visionary Villain who's looking to create a utopia over a mountain of criminal corpses, and has made an enemy of L in the process.
See Light Yagami for further details.
- Big Bad
- Foil: Following on from the above, he's a megalomaniacal Serial Killer who's convinced he's in the right, whereas L is a detective who for all his faults, is well and fully aware of his flaws and mistakes, even if he's stubborn to change.
- Hidden Villain: As someone who's continued existence relies on them being anonymous, though L is convinced Light is Kira. He's dead right.
- The Reveal: Played with. The reader already knows Light is Kira, given he's the Villain Protagonist of the original series. Erin doesn't however, and is horrified to realize that they are one and the same.