- Voice Actor (CV)
- Takehito Koyasu
- Role
- Supporting
- Identity
- A former elite scientist of Sidonia, core member of the Immortal Ship Council, operating covertly as a clone within Captain Kobayashi's inner circle while secretly spearheading the Gauna weapon development program
Personality
Coldly Rational
Obsessive Evolutionist
Ruthlessly Pragmatic
Strategically Calculating
Once regarded as one of Sidonia's most brilliant scientific minds and a pivotal figure within the Immortal Ship Council, Ochiai's consciousness survived his century-old betrayal by persisting within an auxiliary brain. In the second season, he seizes control of Gauna Norio's body, covertly engineering the creation of the hybrid entity known as Tsumugi Shiraui. Utterly devoid of ethical restraint, Ochiai pursues the co-evolution of humanity and Gauna with chilling detachment, positioning himself as the shadowy architect behind the series' most dangerous conspiracies.