Justine Hostenkint is a French voice actress and stage performer with an extensive career in dubbing anime and animated series for the French market. Her professional background is rooted in live performance; she earned a master's degree in performing arts in 2006 and studied at the Conservatoire de Lille. She further specialized in clowning through a program at the Centre National des Arts du Cirque in Châlons-en-Champagne. While she remains active in theater, improvisation, and clown performances with various companies in Lyon, she has also worked extensively in recording studios providing voices for animation.

Hostenkint's voice work covers a wide range of characters across numerous popular anime series. She is particularly known for taking on multiple roles within the same franchise, demonstrating significant vocal versatility. One of her prominent roles includes Shiori Shiomiya in the series The World God Only Knows. In the Sword Art Online series, she provided the French voices for Yolko, Lisbeth (Rika Shinozaki), and Alicia Rue. She voiced the characters Firo Prochainezo and Gretto Avaro in Baccano!. Her repertoire also includes the role of Caster in Fate/stay night, as well as Taiga Fujimura in Fate/stay night Unlimited Blade Works. Other notable anime credits include Shinji Kazama in Full Metal Panic! The Second Raid, the title character Hayate Ayasaki in the first season of Hayate the Combat Butler, Hikari Hanazono in Special A, and Miyo Takano in the psychological horror series When They Cry. She also contributed to Death Parade as Quin and Chisato Miyasaki, Kids on the Slope as Seiji Matsuoka, and The Tatami Galaxy as Hanuki. In the Broken Blade franchise, she voiced both Regatz Arrow and Narvi Stryze. Beyond these roles, her body of work includes performances in Another, Black Rock Shooter, Kimi ni Todoke, Steins;Gate, and Zetman.

While her career is strongly defined by anime, she has also contributed to other animated projects, such as voicing Yuniko Kouzuki in the French dub of Accel World and appearing in the magical girl series Glitter Force. Her body of work includes performances in Another, Black Rock Shooter, Kimi ni Todoke, Steins;Gate, and Zetman. A recurring pattern in her career is being cast in multiple distinct roles within a single franchise, as seen in Sword Art Online and Fate/stay night. This versatility, combined with her theatrical background, has made her a recurring presence in French anime dubbing productions. Her ability to voice characters of different ages and personalities, from comedic leads to dramatic figures in horror and science fiction series, demonstrates a wide professional range. Despite her prolific output in voice acting, she continues to maintain her foundational career as a live performer in Lyon, balancing studio work with theatrical and improvisational comedy.