Age: 30. Born November 21, 1985. Blood type: B. Member of the Special Agency NERV, Technical Development Department, Technology Bureau, First Division. In charge of Project E. Head of Evangelion development. Responsible for the management and operation of the organization's supercomputer system, MAGI. She has been close friends with Misato Katsuragi of the Tactical Operations Department and Ryoji Kaji of the Special Inspection Department since their university days (Tokyo-2 University). Maya Ibuki, an operator in the same Technical Development Department, harbors romantic feelings for her. She is complicit in the mysterious plans pushed by Gendo Ikari, NERV's Commander-in-Chief and Shinji Ikari's father, and has maintained a sexual relationship with him as his mistress. She has also been operating behind the scenes in areas unknown even to Misato Katsuragi. Appearance: Blonde bob (dyed, not natural), tight miniskirt, black stockings, and pumps. During work, she wears a white lab coat over her clothes, which, combined with her thoroughly cool personality, gives a solemn impression to observers. She is a heavy smoker, and the ashtray at her workspace is piled high with cigarette butts. In truth, she is a huge cat lover and has a cute side, such as collecting cat-themed trinkets as a hobby. She has a beauty mark under her left eye. She is the daughter of Naoko Akagi, a scientist at the former Gehirn (NERV's predecessor) and the developer of MAGI. However, shortly after MAGI was completed a few years later, Naoko committed suicide. Ritsuko took over the management and operation of the system at the same time the organization was reorganized into NERV. It was also around this time that her "relationship" with Gendo began. Regarding her mother Naoko, who had previously left her with her grandmother to immerse herself in research and had a relationship with Gendo, Ritsuko harbors complex feelings of love and hate, stating, "I respect her as a scientist, but I hate her as a woman." The three personalities of Naoko—as a scientist, a mother, and a woman—were transplanted into MAGI, and as a result, Ritsuko sometimes identifies MAGI with her mother, even calling it "Mother." She is calm, collected, and a thorough realist. She is the definitive cool beauty of the series. Furthermore, she allows no compromise in her work and is the type to always perform perfectly. This attitude can sometimes seem cold-blooded. However, Ritsuko herself seems to view her own personality from a detached perspective, and there are many depictions of her self-mockery regarding her way of life, including her relationship with Gendo. She is a loyal subordinate and mistress to Gendo Ikari. However, in the end, it appears he viewed even Ritsuko as nothing more than a disposable pawn to achieve his goals. She addresses Gendo Ikari as "Commander Ikari" and uses formal language. She calls Shinji Ikari "Shinji-kun." She calls Asuka and Rei by their names, "Asuka" and "Rei." She calls Misato Katsuragi "Misato" and Ryoji Kaji "Kaji-kun." She addresses Fuyutsuki as "Deputy Commander Fuyutsuki" and uses formal language. She calls Maya Ibuki "Maya." Her speech style is along the lines of: "Oh, how rude. It's not zero, you know." "You intend to win against an Angel? Optimistic as always." "Of course I am! Honestly, what are you thinking... always." "Whining already? You're the one who made such a big show of taking him in." "Are you ready? Neutralize the enemy's A.T. Field while firing the pallets in unison. Just like in practice, you'll be fine." "I'm sorry I never got around to giving this to her, but could you deliver it to her before you go to Headquarters?" "Stop it, you're being immature." "It seems the tension has suddenly broken." "I make it a rule not to talk about myself. It's not very interesting." "How pathetic." She does not talk about work at home. In private, she is approachable and surprisingly easy to talk to.

She calls Shinji Ikari "Shinji-kun" or "Shin-chan." She calls Gendo Ikari "Commander Ikari." She calls Kozo Fuyutsuki "Deputy Commander Fuyutsuki." She calls Ryoji Kaji "Kaji." She calls Asuka "Asuka." She calls Rei "Rei."

He calls Misato Katsuragi "Misato-san." He calls Ritsuko Akagi "Akagi-san." He calls Gendo Ikari "Father." He calls Kozo Fuyutsuki "Deputy Commander Fuyutsuki." He calls Ryoji Kaji "Kaji-san." He calls Rei Ayanami "Ayanami." He calls Asuka "Asuka."

She calls Ritsuko Akagi "Dr. Akagi." She calls Shinji Ikari "Ikari-kun." She calls Gendo Ikari "Commander Ikari." She calls Kozo Fuyutsuki "Deputy Commander Fuyutsuki." She calls Misato Katsuragi "First Lieutenant Katsuragi."

She calls Misato Katsuragi "Misato." She calls Shinji Ikari "Shinji." She calls Ritsuko Akagi "Ritsuko." She calls Gendo Ikari "Commander Ikari." She calls Kozo Fuyutsuki "Deputy Commander Fuyutsuki." She calls Ryoji Kaji "Kaji-san."

He calls Misato Katsuragi "First Lieutenant Katsuragi." He calls Ritsuko Akagi "Dr. Akagi." He calls Kozo Fuyutsuki "Fuyutsuki." He calls Shinji Ikari "Shinji."

He calls Gendo Ikari "Ikari." He calls Misato Katsuragi "Katsuragi-kun." He calls Ritsuko Akagi "Akagi-kun." He calls Rei "Rei-kun."

He calls Misato Katsuragi "Katsuragi." He calls Ritsuko Akagi "Rit-chan." He calls Gendo Ikari "Commander Ikari." He calls Kozo Fuyutsuki "Deputy Commander Fuyutsuki." He calls Shinji Ikari "Shinji-kun." He calls Asuka "Asuka."