Shinobu Adachi is a Japanese actress and voice actress born on April 7, 1958, in Tokyo, Japan. She began her career on stage after joining the Theatre Echo training school and made her voice acting debut in 1981 as Hiromi in the anime series Miss Machiko. After a brief hiatus following her marriage and the birth of her son, she returned to voice acting in 1984 and has remained active in the industry for over four decades. Throughout her career, she has been affiliated with Theatre Echo, 81 Produce, and as of 2023, is a member of the agency Mouvement.

Adachi is well-known for her versatility, particularly her ability to portray energetic young boys, a skill she demonstrated in many of her most iconic roles. Her most celebrated performance is as Rabi, the rabbit boy from the 1989 television series Madō King Granzort, a role she reprised in its various OVA sequels including Bōken-hen, Non-Stop Rabi, and The Final Magical Battle. This character remains closely associated with her and holds a special place in her career. Another of her significant long-running roles is Miki Jonouchi in the Future GPX Cyber Formula franchise, appearing in the television series and multiple OVAs such as Early Days Renewal, Saga, Zero, and 11. Her film work includes the role of Kayra Su in the 1988 animated film Mobile Suit Gundam: Char's Counterattack.

Beyond these signature parts, Adachi's extensive filmography includes a wide range of characters across numerous series. She voiced Tom in both the Huckleberry Finn Monogatari television series and the Huckleberry Monogatari OVA. In the Aura Battle Dunbine OVA The Tale of Neo Byston Well, she played Beraana Gariaha, and she was Kenta in the OVA Pendant. For younger audiences, she lent her voice to Peizuri in Shima Shima Tora no Shimajirou, Prince Flower in Yume no Hoshi no Button Nose, and the title character in Calimero. Her repertoire also includes horror, such as the role of Rima in Umezu Kazuo no Noroi, and sports anime, as Michael in Bakusō Kyōdai Let's & Go!! WGP. Additional credited roles from the provided list include Jagainu in Jagainu-kun and Midori in Bug tte Honey, as well as Iverson in The Story of Fifteen Boys and Tanner in Space Travelers.

Throughout her career, Adachi has frequently collaborated with a number of fellow voice actors. She has worked with Shimada Min on fourteen productions, including Madō King Granzort and The Story of Lassie. She has also shared twelve projects with Shioya Kouzo, such as The Story of Perrine and The Brave Fighter of Legend Da-Garn, and eleven with Nishimura Chikao, appearing together in The Hakkenden and Patlabor 2: The Movie. Her influence extends to inspiring younger talent, as voice actress Ai Yamamoto has cited Adachi's performance as Michael in Bakusō Kyōdai Let's & Go!! as a key inspiration for her own career choice.

In addition to her anime work, Adachi has a prolific career in dubbing foreign films and television series. She is notably the long-term Japanese dubbing voice for actress Jennifer Aniston, including her iconic role as Rachel Green on the television series Friends. Her extensive dubbing work also includes providing voices for films such as the Ghostbusters series and Despicable Me, and for characters in shows like Desperate Housewives and The X-Men animated series. Her contributions to the industry extend to video games, where she has voiced characters in numerous titles including the Super Robot Wars series, Kingdom Hearts, and Brave Fencer Musashiden.