Makoto Saionji is a member of the organization E-RDE, specifically its division known as Light, or Vierde. Saionji is an unconventional fighter who stands out by wearing a monster costume, which gives an intimidating presence on the battlefield. Within combat, Saionji controls a kaiju named Hephaestus, also referred to as Cauldron of the Marshal, making Saionji a dangerous frontline asset for E-RDE. Saionji's role in the story is that of an opponent to Tetsuo Yabusame and the group of survivors, serving as one of the more memorable and destructive members of the organization. Saionji is depicted with brown hair of ear length and unseen eyes, and is often categorized as a child or young character. The motivations and personality of Saionji are not extensively detailed, but the character's distinctive appearance and reliance on a monster companion suggest a theatrical or eccentric manner. Key relationships are primarily defined by Saionji's alignment with E-RDE and opposition to the main protagonists. Saionji's notable ability is the command and coordination of the kaiju Hephaestus in battle.