Ikuko Tatsu is a Japanese voice actress known for her work in anime, video games, and foreign film dubbing. She was born on April 23, 1958, in Kawasaki City, Kanagawa Prefecture, Japan. Her blood type is A. She is a graduate of the Faculty of Letters at Senshu University. Her professional journey in the entertainment industry began with the theater troupe Tomodachi, followed by a period with Nine Production, before she eventually affiliated with the agency Aoni Production.

Tatsu possesses an alto to mezzo-soprano vocal range. Throughout her career, which has been active from the 1980s, she has become known for portraying a wide variety of characters, with a particular emphasis on maternal figures, elderly women, and authoritative roles such as teachers and principals. Her anime voice acting credits include numerous long-running and popular series. She appeared in the Mobile Suit Gundam franchise as Estel Chabary in Mobile Suit V Gundam. Her other notable anime roles include appearances in Crayon Shin-chan as Tatsuko's mother, in Delicious Miracle as a restaurant proprietress, in GeGeGe no Kitaro, in One Piece, and in the series Esper Mami and City Hunter. She also lent her voice to the character Sumiyo in the Takahashi Rumiko Gekijō and played a school nurse in NoNoChan. For the feature film The Simpsons Movie, she provided the voice for a shaman.

In addition to her work on Japanese animation, Tatsu has an extensive career in dubbing foreign language films and television series. Her notable dubbing roles include playing Piper Laurie’s character Catherine Martell in the Japanese-language version of Twin Peaks, as well as work on series such as Desperate Housewives, The X-Files, Ally McBeal, and Knight Rider. For films, she contributed to the dubs of The Addams Family, Ghost, Mad City, Seven Years in Tibet, Once Upon a Time in America, and the Back to the Future sequel. She also provided the voice for the Baroness in the Japanese version of the animated series G.I. Joe.

Her involvement in other media includes roles in video games such as Tales of Symphonia and Hokuto no Ken. She also worked as a voice actor in the tokusatsu genre, voicing antagonists in the series Ultraman Dyna. As specified in the query, her role as the voice of Hanako Kokeshi in the live-action film As the Gods Will is a notable credit, and she also performed in the anime series Twin, which is also known as Bakusō Circuit Roman Twin.