Ami Koshimizu is a renowned Japanese voice actress and singer, celebrated for her versatile performances across a wide spectrum of anime, video games, and film dubbing. Born on February 15, 1986, in Tokyo, she began her career in the entertainment industry at a young age, joining the Theater Company Wakakusa when she was just twelve years old. Her journey into voice acting was inspired by her admiration for fellow actress Mayumi Iizuka. Koshimizu made her debut as a lead voice actress in 2003 while still in high school, landing the title role of Nadja Applefield in the television anime Ashita no Nadja.

Koshimizu's career is marked by a series of iconic and leading roles that showcase her dynamic vocal range. She gained widespread recognition for her portrayal of the fierce and determined Kallen Stadtfeld (also known as Kallen Kozuki) in the massively popular mecha series Code Geass: Lelouch of the Rebellion. This performance earned her the "Best Actress in a Supporting Role" award at the 1st Seiyu Awards in 2007, a significant honor that solidified her status in the industry. Another defining role came as the sharp-witted and playful wolf-deity Holo in the beloved fantasy adventure Spice and Wolf, a character she voiced alongside Jun Fukuyama. She also brought explosive energy and intensity to the lead character Ryuko Matoi in the action-packed series Kill la Kill, a role that led to her being a guest of honor at the Anime Expo convention in 2014. Her involvement in long-running and prestigious franchises includes taking on the role of Makoto Kino/Sailor Jupiter in the Sailor Moon Crystal series and its subsequent films, succeeding the original voice actress. Furthermore, she voices Yang Xiao Long in the Japanese dub of the global hit RWBY and its anime spin-off, RWBY: Ice Queendom.

Beyond these signature roles, Koshimizu has demonstrated remarkable consistency and breadth, contributing to numerous other series. Among the many titles mentioned by the user, her filmography includes the role of Shizuri Mugino in the A Certain Scientific Railgun series, Tenma Tsukamoto in School Rumble, Anemone in Eureka Seven, Charlotte E. Yeager in the Strike Witches franchise, and Hibiki Hojo/Cure Melody in Suite PreCure. She has also voiced characters in more recent productions such as Mizuki Nakahara in the critically acclaimed original anime Lycoris Recoil, Kilmaria in My One-Hit Kill Sister, and Vera Rustamova in Deep Insanity: The Lost Child. Her work extends into video games, where she is known for voicing Yukiko Amagi in the Persona 4 series, Agnès Oblige in Bravely Default, and Beidou in the global phenomenon Genshin Impact.

Throughout her career, Koshimizu has been affiliated with several talent agencies. After starting her career, she was with Production Baobab before moving to AXL-ONE in 2011. In 2018, she announced she would be leaving AXL-ONE to work as a freelancer. As of January 2022, she manages her career through her own agency, Office Restart. With a career spanning over two decades, Ami Koshimizu continues to be a prominent and influential figure in the anime industry, known for her powerful performances and her ability to bring a wide array of characters to life.