Susumu Akagi is a Japanese voice actor born on November 28, 1972, in Tokyo, Japan. He is affiliated with the talent management firm Kenyu Office. His career, which began around the year 2000, has been primarily focused on providing voices for supporting roles in anime, though his work also extends to video games and dubbing foreign productions.

Akagi's filmography demonstrates a pattern of voicing characters in long-running and multi-season series. A prominent example is his work in the Ikki Tousen franchise, where he consistently voiced the character Moutoku Sousou across multiple installments. These include the 2003 original series, Ikki Tousen: Dragon Destiny in 2007, Ikki Tousen: Great Guardians in 2008, Ikki Tousen: Xtreme Xecutor in 2010, as well as various original video animations released between 2012 and 2015. This role represents one of his most sustained engagements with a single character.

Beyond the Ikki Tousen series, Akagi has built a diverse portfolio of roles in both television animation and original video animation. In the anime adaptation of Kingdom, he is credited with the role of En. He also provided voices for characters in a wide range of other series, such as Hans in Nodame Cantabile, Gi Batos in Spice and Wolf II, Emperor Il in Yona of the Dawn, and Babanuki in One Piece. His early career in the 2000s also included numerous supporting and guest roles in series like Bleach, Blood+, and Gintama, as documented in comprehensive Japanese-language sources.

In addition to his animation work, Susumu Akagi has an active career in voice-over for video games and foreign live-action projects. Notable video game credits include providing the Japanese voice for the character Goenitz in both The King of Fighters All Star and The King of Fighters XV, as well as roles in Granblue Fantasy and Black Clover: Quartet Knights. His dubbing work encompasses a variety of films, where he voices characters for the Japanese-language release. Examples include providing the voice for Jim Beach in the Japanese dub of Bohemian Rhapsody and a role in the film The Finest Hours. This breadth of work across different media highlights his versatility and steady presence in the Japanese voice acting industry.