| Role | Character | Appears In |
| Main character of the tetrology. Following the death of his best friend, his life becomes a none stop search for truth. | |
| A young stubborn man who begins an obsessive relationship with Satoko. | |
| A treacherous maid who attempts suicide after revealing Satoko's love affair. | |
| The Prince to which Satoko is engaged. | |
| A radical right-wing youth, and protagonist of Runaway Horses. He commits suicide after murdering Busuke Kurahara | |
| Daughter of a retired general, she is in love with the protagonist of Runaway Horses. This poet lies to avert his conviction. | |
| Thai princess. Successfully saved near the end of Temple of Dawn, she is killed by a snake bite in a garden. | |
| The main character's neighbor in Temple of Dawn. Though she dates an American named Jack, she is later revealed to be a lesbian. | |
| Author of violent erotic who dies while sleeping with Tsubakihara during a house fire. | |
| A violent orphan adopted in Decay of the Angel. He poisons himself in an attempt to become reincarnated, but only succeeds in blinding himself. | |