|Branch of Sin||Unknown|
|Manga debut||Chapter 13|
|Anime debut||Episode 8|
Akiyama is a Deadman, previously imprisoned in Deadman Wonderland and a former member of Scar Chain. He is one of the surviving members of the Deadman mass prison break. After the prison was shut down, he came back along with the infiltration team as part of Operation Mother-Gizmo Reinforcement in order to stop Hagire Rinichirō and seal off The Wretched Egg's powers.
Akiyama is a dark-skinned man. He has squinted eyes and a bald head. He dresses in a white shirt with a dark blue striped sweater over it and regular pants.
Scar Chain arc
Akiyama participates in the Deadman mass prison break. In the first attempt, he is amongst Ganta's group carrying the data chip. After taking an elevator, the group encounters Genkaku. In the ensuing battle, Akiyama was one of the few deadmen that survived.
Return to DW arc
Akiyama returns to Deadman Wonderland with Karako as part of Makina's forces on the mission to seal the Wretched Egg and saves her.
Branch of Sin: Akiyama is a Deadman, so he can freely move his blood out of his body, his personalized Branch of Sin was never shown.
Differences between Manga and Anime
- Akiyama originally survived the prison break but in the anime, Akiyama was immediately shot by Genkaku's machine guns and then dies while protecting Ganta from an Undertaker.
- Akiyama is then shown escaping on the ship in the anime, however, it seems that his role is filled by Endō.
|G Ward||Kiyomasa Senji · Minatsuki Takami · Chaplin Sukegawa · Idaki Hitara · Itadaki "Masu" Kazuya · Mitsuzaki Yosuga · Toto Sakigami · Albatross · King Fisher|
|Scar Chain||Ganta Igarashi · Nagi Kengamine · Karako Koshio · Rokuro Bundō · Endō · Ohara · Kosugi · Kōmoto · Miya/Harumi · Wakabayashi · Yamazaki · Akiyama · Ueshima · Miyako · Kazu · Fujiyoshi/Matayoshi · Unnamed Deadman|
|Other||Shiro · Wretched Egg · Chan and En · Hagire Rinichirō · Keigo Ugachi (OVA only)|