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Reason: Information can be combined with Division II.
The majority of ghoul investigators belong to Division I.
- Kiyoko Aura - Special Class, Division Chief
- Juuzou Suzuya - Special Class, S3 Squad Leader
- Hirokazu Tainaka - First Class
- Kuki Urie - First Class, S2 Squad Leader
- Mougan Tanakamaru - Special Class, S1 Squad Leader
- Koori Ui - Special Class, Bureau Chief Advisor
- Koutarou Amon - Special Class (Defected)
- Mutsumi Chino - Associate Special Class (Declared Dead)
- Yukinori Shinohara - Special Class (Comatose State)
- Seidou Takizawa - Rank 2 (Defected)
- Haise Sasaki - Associate Special Class, S3 Squad Secretary (Defected)
- Kousuke Houji † - Special Class, 5th Ward Branch Director.
- Iwao Kuroiwa † - Special Class