Diam was a member of Magistrum's court, appearing briefly in Shin Devilman.


Diam was a humanoid demon with fish like qualities. He had a set of three ridge-shaped fins on his head and gills on his stomach, his skin was covered in black markings.


Diam took part in the kidnap of Jeanne D'Arc  where she was tried at Magistrum's court. He is presumably killed when Akira arrives.


  • Diam like several other demons of the Court is seemingly based on a demon from the original manga, in Diam's case it was the demon Najuwarle.