1 Introduction  
2 LLM Role-Playing  
2.1 Environments  
2.2 Role-Playing Schema  
2.3 Emergent Behaviors in Role-Playing  
3 LLM Personalization  
3.1 Personalized Recommendation  
3.2 Personalized Search  
3.3 Personalized Education  
3.4 Personalized Healthcare  
3.5 Personalized Dialogue Generation  
4 LLM Personality Evaluation  
5 Limitations and Future Directions  
5.1 Towards a General Framework  
5.2 Long-Context Personas  
5.3 Lack of Datasets and Benchmarks  
5.4 Bias  
5.5 Safety and Privacy  
5.6 Broader Influences  
6 Conclusion