Appearing as an ordinary fortune-telling school, Sephiro Fiore is training institution for Elemental Tarot users made for the sole purpose of exterminating the Daemonia to protect people from their wrath, even though this means killing the people possessed by them. There are several branches of this organization, one of which is located in Nagataki, where our story takes place.
Dirty Business: They pretty much all consider themselves to be executioners as much as saviors, and they're not pleased with the idea at all.
Magical Girl: The main characters must transform to use their power.
The main character who wants to be a fortune teller like her late mother. Her tarot is "The Sun".
Break the Cutie: Sephiro Fiore goes out of their way to defy this by altering Akari's memories of killing Fuyuna so she won't turn into a Daemonia in her grief. The bad news is, Akari not only regains her memories, but also learns that this is what she's expected to do from now on. And on her first day of school, no less. The good news is, it's not bad enough for her to turn into a Daemonia.
A Darker Me: Her magical girl self is considerably more eager to fight than her mundane self.
Disappeared Dad: In episode 5 we learn that she once tried to ask her mother about her dad, but the response she got was her mother looking really sad. Episode 11 reveals that her father was a Daemonia researcher, and that Akari was conceived while he was infected.
Green Thumb: Her presence causes plant life to grow uncontrollably.
Half-Human Hybrid: When she was conceived, her father was infected by a Daemonia, resulting in her being half-human, half-Daemonia, and that's why she can hear the voices of Daemonia.
Hearing Voices: Can actually hear Daemonia, which is apparently something that has never happened before. The other characters are skeptical, until it's shown that the other girls can hear Daemonia too while they're touching Akari.
Telepathy: The Tendo sisters explain that Akari is actually sharing her thoughts when someone's touching her.
It's explained later that she can hear their voices because she's half-Daemonia herself.
Heroic BSOD: Goes through one when she learns the truth about what happened to Fuyuna.
Innocently Insensitive: Akari doesn't mind the attention she gets at home and around town, but she genuinely doesn't realize how bitter it makes Fuyuna. She also doesn't seem to notice Luna's jealousy when she's around Seira.
Ironic Echo: Seira considered her to have a lack of resolve because of her ability to hear The Daemonia's voices. After Seira hesitates after finding out about her friend. Akari calls her out on it.
Let's Get Dangerous: Normally a bright and cheery girl, she becomes dead serious (and deadly) after she transforms.
My God, What Have I Done?/Tears of Remorse: When she realizes Fuyuna has died by her own hand and that not even her own aunt and uncle (Fuyuna's parents) remember her, Akari breaks down and apologizes over and over to her aunt.
Possession Implies Mastery: She seems to immediately understand how to fight and use her powers after transforming. It's suggested this is true of all Elemental Tarot wielders, which would explain why Sephiro Fiore doesn't actually train the tarot users in combat.
Power Incontinence: The reason plants grow so quickly in her room; plants need the sun to grow, after all.
Break the Cutie: Ginka's "death" sends Luna into a Heroic BSOD thinking she could be the next to go. She takes indefinite leave to her family retreat to recuperate, and things seem to be looking up when she's visited by Akari and finally gets some time alone with her. Then "Akari" (who's really Cerebrum in disguise) breaks her even further by saying she'd rather spend time with Seira, stabs her, and sticks a Diablos card in her wound that turns her into a Daemonia.
An Axe to Grind: Her power-up gained from the resolve to kill her corrupted uncle.
Angst? What Angst?: invokedZigzagged. Initially, she sees her job as exactly that; she's doing it well and thus all is fine in the world, even if it means she has to kill the formerly-people monsters. However, she later gets a rude awakening when her Honorary Uncle is corrupted into one of them monsters. The series doesn't show whether that incident causes any damage to her psyche, but eventually she is driven to throw away her life to destroy her Evil Counterpart, and she does so with that very same calmness.
Ancient Order of Protectors: The other magical girls are selected, but her family has been in this tarot business for a long time (her grand-auntie was an Elemental user). This is probably the reason why she takes her job lightheartedly, for all that it entails.
The Heart: In keeping with her "Temperance" card, she strives to maintain balance in her team; when the others are feeling down, she acts bright and cheery.
Heroic Sacrifice: She fights her Diablos counterpart in a suicide battle that results in both disappearing. It also permanently destroys all Temperance Daemonia. She gets better, explaining that fighting her counterpart is not about annihilation but rather unification.
Mutual Kill: What Ginka thinks will happen, but later realizes that's not necessarily the case.
The Idiot from Osaka: As a bubbly airhead who loves food and money, she fits most of the stereotypes to a tee. Subverted in episode 5, where she shows her ability to think logically in extremely dire situations and puts much more thought into the central ethical question of the initial part of the show than either Akari or Seira.
Sealed Evil in a Duel: This is what apparently happened after her Mutual Kill with her counterpart card. They kept fighting each other until Ginka heard Akari's voice, allowing her to defeat her counterpart and return to life.
Spoiled Sweet: An interesting case where she did not start as a rich girl, but retain her sweetness after the fortunes finally favor her family.
A member of Sephiro Fiore's Moscow Branch, and her Card is The Lovers. Her name is not mentioned in the anime, but it's revealed in the light novel prequel, and she was Hinata's partner. She's the first known causality of the Pair Annihilation Phenomenon.
Posthumous Character: Her disappearance is the first mention of her in-story, and the next mention of her confirms her death.
Another character from the light novel prequel. He is a Daemonia researcher for Sephiro Fiore. He is also Akari's father, and he was already possessed by a Daemonia when she was conceived.
Posthumous Character: In the anime. All Etia and Ariel say is that he was taken away by the Leguzario when they found out he was possessed by a Daemonia, and his death is implied.
Voiced by: Ayane Sakura
Akari's cousin and honors student who is jealous of all the attention Akari gets. In the first episode, she's turned into a Daemonia, killed by Akari, and erased from history.
Back for the FinaleFor The Dead: Kind of. In the next-to-last episode Akari is trapped in a "Groundhog Day" Loop where she has to relive the day she killed Fuyuna again and again. Cerebrum says each loop was an alternate possibility that could have happened. In the last episode, the Fuyuna of the loop's final iteration actually discusses her feelings with Akari, and the two part with Akari getting closure.
Voiced by: Chado Horii (Laplace) and Shiori Izawa (Schrödinger)
A talking crow and a talking cat that monitor Sephiro Fiore. Something of note: the crow is male and the cat is female. The two of them actually report to the Leguzario, the organization in charge of Sephiro Fiore.
Evil Virtues/I Gave My Word: Honesty/Honor. Fully and immediately delivers on his promise to remove Luna's corruption and restore Seira's powers after the agreement is reached. Considering the two were locked in mortal combat at the time, he put honoring the deal before disposing of his enemies.