Otoichi Kinoe is a supporting character in the anime Snowball Earth. He is a male teenager with green eyes and shoulder-length purple hair. He belongs to the group of monster users known as the Light of E-RDE, or Vield, a unit in which each member commands a monster named after a figure from Greek mythology. Within Vield, Otoichi takes on a role similar to a strategist or staff officer, staying close to the group's leader, Sagami Isseki, and supporting him in an advisory capacity. This places him among the more trusted members of the organization rather than among its frontline fighters.

His notable ability is the command of a monster called the Swift Runner of the Marshal, Hermes. The name refers to the Greek god Hermes, who is associated with speed, travel, and swift movement, which suggests that Otoichi's contribution to the group may be tied to mobility or rapid response, though the full extent of his combat role is not depicted in detail.

Otoichi's personal background, personality, and individual motivations are not explored in depth. His character is defined primarily by his function within Vield, which is organized around loyalty to Sagami, and his most important relationship is therefore with Sagami, whose side he keeps while carrying out his strategic duties. In the story, Vield comes into conflict with the protagonist Tetsuo Yabusame after the group learns that he has survived, and its members oppose the myth of the savior that surrounds him. This places Otoichi among the characters aligned against the protagonist, though his role in that opposition is that of a tactician rather than a direct aggressor. A distinct personal development arc for Otoichi has not been detailed, as his presence in the narrative is tied mainly to his position within the group.