Justine Hostekint is a French voice actress and stage performer known for her extensive work 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.

Hostekint's voice work covers a wide range of characters across numerous popular anime series. She is known for taking on multiple roles within the same franchise, demonstrating her vocal versatility. In the Sword Art Online series, she provided the French voices for Yolko, Lisbeth (Rika Shinozaki), and Alicia Rue. Beyond Sword Art Online, her major voice roles include Firo Prochainezo and Gretto Avaro in Baccano!, Caster in Fate/stay night, Shinji Kazama in Full Metal Panic! The Second Raid, and the title character Hayate Ayasaki in the first season of Hayate the Combat Butler. She also voiced Hikari Hanazono in Special A and Miyo Takano in the psychological horror series When They Cry, known in French as Hinamizawa, le village maudit.

Additional credits include characters in Death Parade as Quin and Chisato Miyasaki, Seiji Matsuoka in Kids on the Slope, Hanuki in The Tatami Galaxy, and both Regatz Arrow and Narvi Stryze in the Broken Blade franchise. She has also contributed to other animated projects, such as voicing Yuniko Kouzuki in the French dub of Accel World, as well as roles in Black Rock Shooter, Another, Super Gals!, Romeo x Juliet, Casshern Sins, and Zetman. Her career is characterized by a prolific output in anime dubbing for the French market and a notable ability to portray diverse character types across multiple genres.