Keiko Han is a prominent Japanese actress and voice actress who has been active in the industry since the 1970s. Born on April 5, 1953, in Tokyo, she is a graduate of Toyo Eiwa Jogakuin University and Nihon University College of Arts and Future Theater. She is the daughter of Taiwanese parents. Her entry into voice acting was encouraged by fellow voice actors Kenji Utsumi and Michiko Nomura, with whom she had performed in a theatrical troupe.

Han is widely recognized for several iconic roles that have defined her career. She is most known for voicing Lalah Sune in the Mobile Suit Gundam franchise, a role she has reprised numerous times across various series and films. Another landmark role is Saori Kido, the reincarnation of the goddess Athena, in the long-running Saint Seiya series. She also lent her voice to the characters Luna and Queen Beryl in the hugely popular Sailor Moon franchise. Her work spans multiple decades and includes leading roles in World Masterpiece Theater productions, such as Annette in The Alps Story: My Annette, Becky Thatcher in The Adventures of Tom Sawyer, and Meg March in Little Women. In the science fiction genre, she is also known for her role as Annerose von Grünewald in the Legend of the Galactic Heroes series.

Beyond these hallmark roles, Han has demonstrated remarkable range across a wide spectrum of anime. The user's query references a number of these performances, which span her extensive career. These include early roles such as Sanae Shiratori in Future Robot Daltanious (1979), Princess Ruda Shalbart in Star Blazers: The Bolar Wars (also known as Space Battleship Yamato III), Gwynevere in Entaku no Kishi Monogatari: Moero Arthur, and Patty Ellington in Armored Fleet Dairugger XV. Her film work from this period includes Sasha in Be Forever Yamato, Junko Sawakawa in Harmagedon, and Jessica in Locke the Superman. She voiced characters in numerous other series and films, including Clara Sesemann in Alps no Shōjo Heidi, Nancy in Pollyanna, Pialé in Sea Prince and the Fire Child, Angie in Angie Girl, Miyuki Ōyama in Prefectural Earth Defense Force, and Olivia Lawrence in Video Warrior Laserion.

Han has continued to work steadily in more recent decades, taking on roles in contemporary series. As noted in the query, these performances include Yuzuha Tsukishiro in IRODUKU: The World in Colors, Yôko Takaoka in Smile Down the Runway, and the dual roles of Ishista and Ishtar in Cautious Hero: The Hero Is Overpowered but Overly Cautious. She also voiced Mito Freecss in the 2011 adaptation of Hunter x Hunter, a series that holds a special distinction as it also features her daughter, Megumi Han, in the lead role of Gon Freecss. Other later roles include a narrator or "Proverb explanations" in Mobile Suit Gundam-san, Hitomi in Chiisana Love Letter, and various characters in films like Garaga, The Door into Summer, and the Anpanman series.

A unique aspect of Keiko Han's public persona is her parallel career as a professional astrologer. She is a published author on the subject of Western horoscopes and has even incorporated her expertise into her voice acting work, such as providing fortune-telling segments for the anime Katekyō Hitman Reborn! and writing an astrology column for Gundam Ace magazine under the title Lalah's Astrology Fortune Telling, a direct reference to her most famous character. She is affiliated with the talent agency Just Production Inc.. Her daughter, Megumi Han, has followed in her footsteps to become a successful voice actress.