Michel Di Fiori is a Brazilian voice actor based in São Paulo who has been active in the dubbing industry since the early 2000s. He began his career as an actor in 1998 before transitioning to voice work, formally starting in dubbing in 2002 after completing a course and interning at various studios. His early career included numerous small roles and participations, notably during the era of the Animax channel in 2005, which provided a substantial amount of work for anime voice actors in Brazil.

Di Fiori is widely recognized for his roles in several major anime series. One of his most prominent and enduring roles is Neji Hyuga in the long-running Naruto franchise. He was cast as Neji after a series of three different auditions, having previously tested for the roles of Naruto Uzumaki, Shikamaru Nara, and Kiba Inuzuka. He has voiced the character across Naruto, Naruto Shippūden, and multiple films in the series.

Another signature role is the cyborg hero Genos in the popular series One Punch Man. Di Fiori described the process for this role as relatively quick, being approved in the first round of tests, after which the project proceeded under significant secrecy for several months before recording began. He has noted the unique challenge of voicing Genos, who, as a cyborg, displays few emotions, requiring a performance that was nuanced and not "dead". The Brazilian Portuguese dubbing of One Punch Man, in which he starred alongside Yuri Chesman as Saitama, was notable for the creative freedom given to the cast and director, allowing for adapted dialogue and jokes intended to remain timeless.

His extensive filmography, as documented by Anime News Network, includes a wide array of characters across numerous other titles. He voices Kai in BEASTARS, 13 in Dorohedoro, B-20N in the Star Wars: Visions short The Twins, and Aren Kuboyasu in The Disastrous Life of Saiki K.: Reawakened. He is also the Portuguese voice of Rohan Kishibe in various JoJo's Bizarre Adventure adaptations, including Thus Spoke Kishibe Rohan. Other notable credits include Pariston Hill in Hunter × Hunter (2011), Saruta in Mob Psycho 100, Gotoh in Demon Slayer: Kimetsu no Yaiba, and roles in series like Boruto: Naruto Next Generations, Baki, and Bastard!!.

Throughout his career, Di Fiori has been involved in several projects with recurring collaborators. Diego Lima directed the Brazilian dub of One Punch Man, a production where Di Fiori noted a strong collaborative dynamic with the director and fellow voice actor Yuri Chesman. While not a formal collaboration, forum discussions have noted a perceived vocal similarity between Di Fiori and voice actor Adrian Tatini, particularly in the role of Kai from BEASTARS.

Michel Di Fiori's work is characterized by a dedication to his craft, emphasizing the importance of concentration and vocal health, especially for roles that require intense or unusual vocalizations. He views dubbing as a profession that allows him to embody a vast range of characters, describing it as "an alternative real world".