Anna Riddle

Anna Riddle is Tate Karito's partner and broker. She resides in the Tea Room Siren, a cafe established by herself and Karito where she aids those who can solve her riddles.

When Haruka Touyama is enrolled in Aitou Academy, Anna is also enrolled as backup under the name Anna Kitagami (北神アナ). Both are assigned to Class 2-B, under Jesus' (as Shingo Fujisawa's) instruction.

Like Tate, she is a crossover character from Kyouichi Nanatsuki's Aegis in the Dark. She also appears in Aegis in the Dawn and JESUS Sajin Kouro, which were co-developed with Hiroshi Takashige and interweave with the Until Death Do Us Part timeline.

Appearance
Anna appears to be a young, adolescent girl with long black hair and large brown eyes. She usually wore a muted blue, knee-high dress with long white socks and dark shoes.

Upon enrolling into Aitou Academy, she wore the school uniform.

Personality
Anna is silent and reclusive, typically sitting alone at the first table in Tea Room Siren. There, she asks a riddle to clients who enter; only those who answer correctly will have their cases heard out. The only one above this ritual is Daiba Tatsumi, who never bothers answering her riddles yet uses Tate's abilities anyways.

Due to her naturally-high IQ and extremely high intelligence, plus the unique circumstances of her childhood, she doesn't often mix with people her age. However, she eventually grows close to Haruka Tooyama and Ashe, both of whom were in circumstances similar to hers.

Prior experience with dangerous situations combined with her high intuitive abilities makes Anna nigh-unflappable even in the face of highly volatile situations. While she has no combat abilities of her own, she walks into dangerous situations without a hint of doubt, though she also knows how to keep herself hidden to avoid being a liability.

Despite all of the above, Anna is not above certain childish streaks. For one, she gets intensely jealous over Tate and can act rather petty towards those she thinks are a "threat" to her relationship with him. She also dislikes those who do not abide by her ritual of answering her riddles, and will even refuse to take requests if the potential client does not agree to it. Furthermore, due to her sharp intuition, she grows visibly displeased whenever someone subverts her expectations, as seen when Genda correctly answers her riddle and Jesus reveals he already knew who she was.

History
Anna is the granddaughter of Michele Madonia, the wealthy Sicilian don of Costa Nostra. She was originally born in America to a Japanese father, Kouichi Kitagami, and an Italian mother, Amelia Madonia. Due to fetal brain cell experiments during her mother's pregnancy, Anna was born with an exceptional IQ and has a degree of extrasensory perception. Because the experiment was an overall failure, however, she and her family were soon targeted by those hoping to erase any trace of it.

Her father disappeared&mdash;initially believed dead, but later revealed to be on the run&mdash;while her mother was attacked before Anna's eyes. As Amelia lay dying in the hospital, she played riddles with Anna, leading to Anna's obsession with riddles in the present. Afterwards, her grandfather, feeling responsible for funding the experiments, took her to his home in Sicily. Maids in her grandfather's employ began calling her a "witch" and "siren," superstitiously believing that Anna's presence caused calamity to befall those around her. The young Anna, who overheard them, began to believe the superstitions and secluded herself in her room.

While Tate was in Sicily to seek training from the man once known as the "Aegis," he was enlisted by Anna's grandfather to protect her from harm. While she initially rejected his protection, fearing he would also die because of her, Anna eventually opened up her heart to him. Her grandfather asked Tate to take Anna back to her father's homeland, to which he agreed. Tate told her that he would be her shield while they searched for the answer to her unsolved riddle&mdash;the riddle that Amelia never gave an answer to, as she died before she could.

Epilogue
Seven years after the downfall of Zashid Turus, Anna and Tate visit Haruka's grandmother in her hospital room to inform her of Haruka's wedding. Anna later attends said wedding in person, sitting next to Ashe, while Tate guards Haruka's grandmother who watches from afar.

Abilities
Anna is shown to have ESP, which allows her to gather information beyond normal capabilities.

Anna describes her ability as procuring "contacts and information when an opportunity presents itself. Half is just conjecture based of what's known."

Tate Karito
Anna and Tate are partners in their underground business and she is his agent at the Siren. Having spent many years together by the time of UDDUP, their bond is extremely close; Mamoru, who only had a few days' worth of interactions with her during the Trumps' attack, knew that she'd jump from a great height without hesitation purely because Tate considered her a partner.

Because of their close bond, however, Anna's immaturity is apparent when interacting with those she sees as a "threat" to said bond. In UDDUP, it mostly manifests in her interactions with Teppei Genda. When Tate accepts a request from Genda directly without consulting her, she voices her displeasure to Tate and grows huffy with Genda.

Daiba Tatsumi and SPARC
She is shown to get along well with SPARC, Daiba Tatsumi's super-computer, because it answers her riddles, unlike its master, who never does. She sometimes exchanges information with Daiba and SPARC to help Tate with his jobs.

Despite some of her petty attitude coming out while interacting with Daiba, she nonetheless agrees to go along with his plan to help Haruka and use her abilities to manage the situation at Aitou Academy.

Trivia

 * All of Anna's riddles come from a newspaper section that Nanatsuki liked reading.
 * Her "unsolved riddle" was one posted on the newspaper supposedly with no answer, but a reader submitted an answer for it. Impressed, Nanatsuki incorporated it in Aegis in the Dark as Tate's answer to Anna.
 * One rule for the riddles was that it needs to work regardless of language. (However, it may require specific cultural knowledge; for example, the answer to one riddle in Aegis in the Dark was "a return postcard," which is a Japanese-exclusive custom.)
 * In the Japanese version of UDDUP (and seen in some background text left unedited in English versions), her name is spelled "Ana."