Sascha Rotermund is a German actor and voice artist born on June 13, 1974, in Arnsberg, Germany. He initially studied to become a teacher before beginning his acting training in 1997, which he completed in 2001. His early career was rooted in theatre, with ensemble roles at various stages in Germany and France, including a part in Heinrich Mann's Professor Unrat at the Staatstheater Hannover. From the mid-2000s, he became increasingly active in the field of film and series dubbing, establishing himself as a prominent voice actor.

Rotermund has lent his voice to a wide array of characters in anime, animated series, and video game adaptations. In the anime film Harmony, he voiced the character Nuada Kirie. He also provided the German voice for Nagato in the long-running series Naruto Shippuden. In the anime feature Highlander: The Search for Vengeance, a Japanese-American production, he took on the role of the antagonist Marcus Octavius.

Beyond these specific anime roles, Rotermund's voice is well-known in other genres. He is the German dubbing voice for the character Leon S. Kennedy in the CGI animated film Resident Evil: Damnation and its sequel Resident Evil: Death Island. In the Transformers franchise, he voiced the iconic Decepticon leader Megatron in the Netflix animated series Transformers: War for Cybertron Trilogy (specifically in the Siege and Earthrise chapters) and later took over the role of Galvatron in the third season.

While the provided source material does not mention a role for him in the series Fire Force, it confirms his extensive work in dubbing for both animated and live-action productions, where he is known as the German standard voice for actors such as Benedict Cumberbatch, Jon Hamm, and Pedro Pascal.