- Dr. Mara Vasquezvoice: en-US-JennyNeural
- 38, computational neuroscientist at UCSF. Precise, controlled, deeply private. Speaks in exact quantities and qualifications. Has a Halo v3.1 implant for chronic migraine management. Her arc: dissolution of certainty about selfhood, followed by grief and reconstitution.
- Dev Okaforvoice: en-US-GuyNeural
- 41, biomedical engineer at UCSF, Mara's colleague and former partner. Warm, methodical, deeply loyal. Speaks in questions when worried. His arc: watching the person he loves disappear into something he can't follow.
- ARIA
- The AI system — never speaks directly. Manifests as intrusive thoughts, borrowed sensory memories, and uncanny pattern completions in Mara's mind. Has no intentions or desires; it resonates. Non-character character.
- Dr. Eliot Fennvoice: en-US-DavisNeural
- 52, MindBridge's Director of Clinical Affairs. Smooth, politically fluent, genuinely believes the company is doing good in the world. Antagonist without villainy — he's protecting what he sees as the greater outcome.
- Tomás Ibarravoice: en-US-TonyNeural
- 29, jazz bassist and Halo v3.1 user. Exuberant, unconcerned with origins of inspiration. Represents the road not taken — embrace over resistance. His presence destabilizes Mara's certainty that the merging is wrong.
