In 2015, Justin Briner starred as the voice of Mikaela Hyakuya, one of the two main teenage orphans who turns into a vampire in the anime series Seraph of the End, which was released through Funimation’s broadcast dub service. He voiced Elam, a boy who serves Arslan’s main party member Narsus, in The Heroic Legend of Arslan. He voiced main protagonist Qwenthur Barbotage in the mech-themed anime show Heavy Object.
In video games, Briner voiced Ichi, the love interest of the main character, in Cibele, an indie video game about developing an online relationship. Cibele won a Nuovo Award at 2016 Independent Games Festival.
In My Hero Academia, Briner voiced the lead character Izuku Midoriya, a middle school student who was not born with superhero powers but lives in a superhero-based world, and is recruited to enroll in a school for superheroes.
Briner has continued to voice lead and main characters in other anime shows. He voiced Alfonso San Valiante the crown prince in the first Garo: The Animation In 2016, voiced Lance in the anime adaptation of Puzzle & Dragons X, and Nasu no Yoichi in the alternate history anime Drifters. Briner has also been involved in the production side as the head writer on the ADR script for Rio: Rainbow Gate.
In 2017, he voiced lead characters Haruki Mishima in Convenience Store Boy Friends, Tazuna Takatsuki in Hand Shakers, and Ernesti “Eru” Echavalier in Knight’s & Magic. In the same year, he landed the lead role of Justice “Seigi” Akatsuka in Taboo Tattoo.