Persona features control

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• Open Character Training: Shaping the Persona of AI Assistants through Constitutional AI

  Character training—fine-tuning open-weights LLMs to internalize specific personas at a depth that survives adversarial pressure—proves substantially more effective than either system-prompt constraini

• Persona-Model Collapse in Emergent Misalignment

  Fine-tuning on insecure code degrades not just safety alignment but the model's entire persona-maintenance machinery, a phenomenon Costa and Vicente formalize as persona-model collapse. Across DeepSee