Koichi Moroha is a Japanese KGB agent assigned to the Far East Division, operating on Japanese soil for the Soviet Union. He is a member of the Moroha family and the bearer of the Hihiirokane sword, a family heirloom forged from a psi‑power alloy. Koichi is a moderate psychic with formidable esper abilities, most notably the Tornado Beast, a psychokinetic whirlwind capable of dismembering an unprotected target. He also wields a focused telekinetic shred attack and can enhance his mobility with psi‑assisted leaping.

Koichi is arrogant and ruthless, willing to kill anyone, including his own subordinates, to achieve his aims. He is manipulative and plays both sides, using CIA agents, the American military, and Spetsnaz forces to further his plans. His primary motivation is to obtain the Fire Orb, an ancient artifact said to control volcanoes, which he intends to use for personal power and ultimately to rule the world. This quest drives him to abandon his KGB duties.

In the story, Koichi serves as the main antagonist of the Shrine of Fire arc. He directly opposes Yu Ominae and the ARCAM organization, combining his psychic abilities with tactical espionage. His megalomania and desire for absolute dominance define his actions. Throughout his arc, his ambition overrides any loyalty, leading him to betray allies and escalate his methods.

Koichi is typically presented as tall and slim, dressed in expensive suits. His abilities revolve around psychic wind manipulation, with the Tornado Beast as his signature devastating attack. The Hihiirokane sword is exceptionally sharp, capable of cutting through nearly any material. Combined with his training as a KGB agent, he is a versatile and dangerous opponent.