@inproceedings{sadiri-javadi-etal-2026-personality,
title = "Personality Anchoring for Social Simulation: Linking Personality, Social Behavior, and Interaction Success with {LLM} Agents",
author = "Sadiri Javadi, Vahid and
Aksa, Aksa and
R{\'o}g, Fryderyk Karol and
Flek, Lucie and
Trippas, Johanne",
editor = "Stranisci, Marco Antonio and
Falk, Neele and
Labat, Sofie and
Lo, Soda Marem and
Velutharambath, Aswathy and
Weber, Sabine and
Damiano, Rossana and
Frenda, Simona and
Hoste, Veronique and
Kleinberg, Bennett and
Klinger, Roman and
Patti, Viviana and
Plaza-del-Arco, Flor Miriam and
Sap, Maarten and
Yimam, Seid Muhie",
booktitle = "Proceedings of the 1st Workshop on Social Context ({S}o{C}on) and the 2nd Workshop on Integrating {NLP} and Psychology to Study Social Interactions ({NLPSI}) @ {LREC} 2026",
month = may,
year = "2026",
address = "Palma, Mallorca (Spain)",
publisher = "European Language Resources Association (ELRA)",
url = "https://aclanthology.org/2026.socon-1.13/",
doi = "10.63317/5b89agzykziz",
pages = "132--145",
abstract = "Social interactions are shaped by the interplay of dispositional traits and situational context, yet systematically investigating how personality configurations between individuals jointly influence social behavior across diverse social contexts remains methodologically challenging. We address this gap by introducing a simulation pipeline adapted from the CHARISMA framework, which employs well-known movie characters and public figures as psychologically grounded agents for multi-LLM social simulation using a method we term personality anchoring. We present a large-scale empirical study examining how dyadic Agreeableness composition influences social interaction outcomes across 1,010 simulated conversations. Our results reveal a monotonic relationship between dyadic Agreeableness composition and shared goal achievement, with Homogeneous-Agreeable pairs achieving success 10 times the rate of Homogeneous-Disagreeable pairs (62{\%} vs. 6{\%}). Behavioral mediation analysis reveals that Agreeableness shapes goal achievement partially through cooperative strategy selection, though it continues to predict outcomes within the same dominant strategy, indicating pathways beyond observable conversational behavior. Robustness analyses confirm high consistency of results across repeated simulations (ICC = 0.89) and stable personality expression across diverse scenarios, validating personality anchoring as a viable operationalization strategy."
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<abstract>Social interactions are shaped by the interplay of dispositional traits and situational context, yet systematically investigating how personality configurations between individuals jointly influence social behavior across diverse social contexts remains methodologically challenging. We address this gap by introducing a simulation pipeline adapted from the CHARISMA framework, which employs well-known movie characters and public figures as psychologically grounded agents for multi-LLM social simulation using a method we term personality anchoring. We present a large-scale empirical study examining how dyadic Agreeableness composition influences social interaction outcomes across 1,010 simulated conversations. Our results reveal a monotonic relationship between dyadic Agreeableness composition and shared goal achievement, with Homogeneous-Agreeable pairs achieving success 10 times the rate of Homogeneous-Disagreeable pairs (62% vs. 6%). Behavioral mediation analysis reveals that Agreeableness shapes goal achievement partially through cooperative strategy selection, though it continues to predict outcomes within the same dominant strategy, indicating pathways beyond observable conversational behavior. Robustness analyses confirm high consistency of results across repeated simulations (ICC = 0.89) and stable personality expression across diverse scenarios, validating personality anchoring as a viable operationalization strategy.</abstract>
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%0 Conference Proceedings
%T Personality Anchoring for Social Simulation: Linking Personality, Social Behavior, and Interaction Success with LLM Agents
%A Sadiri Javadi, Vahid
%A Aksa, Aksa
%A Róg, Fryderyk Karol
%A Flek, Lucie
%A Trippas, Johanne
%Y Stranisci, Marco Antonio
%Y Falk, Neele
%Y Labat, Sofie
%Y Lo, Soda Marem
%Y Velutharambath, Aswathy
%Y Weber, Sabine
%Y Damiano, Rossana
%Y Frenda, Simona
%Y Hoste, Veronique
%Y Kleinberg, Bennett
%Y Klinger, Roman
%Y Patti, Viviana
%Y Plaza-del-Arco, Flor Miriam
%Y Sap, Maarten
%Y Yimam, Seid Muhie
%S Proceedings of the 1st Workshop on Social Context (SoCon) and the 2nd Workshop on Integrating NLP and Psychology to Study Social Interactions (NLPSI) @ LREC 2026
%D 2026
%8 May
%I European Language Resources Association (ELRA)
%C Palma, Mallorca (Spain)
%F sadiri-javadi-etal-2026-personality
%X Social interactions are shaped by the interplay of dispositional traits and situational context, yet systematically investigating how personality configurations between individuals jointly influence social behavior across diverse social contexts remains methodologically challenging. We address this gap by introducing a simulation pipeline adapted from the CHARISMA framework, which employs well-known movie characters and public figures as psychologically grounded agents for multi-LLM social simulation using a method we term personality anchoring. We present a large-scale empirical study examining how dyadic Agreeableness composition influences social interaction outcomes across 1,010 simulated conversations. Our results reveal a monotonic relationship between dyadic Agreeableness composition and shared goal achievement, with Homogeneous-Agreeable pairs achieving success 10 times the rate of Homogeneous-Disagreeable pairs (62% vs. 6%). Behavioral mediation analysis reveals that Agreeableness shapes goal achievement partially through cooperative strategy selection, though it continues to predict outcomes within the same dominant strategy, indicating pathways beyond observable conversational behavior. Robustness analyses confirm high consistency of results across repeated simulations (ICC = 0.89) and stable personality expression across diverse scenarios, validating personality anchoring as a viable operationalization strategy.
%R 10.63317/5b89agzykziz
%U https://aclanthology.org/2026.socon-1.13/
%U https://doi.org/10.63317/5b89agzykziz
%P 132-145
Markdown (Informal)
[Personality Anchoring for Social Simulation: Linking Personality, Social Behavior, and Interaction Success with LLM Agents](https://aclanthology.org/2026.socon-1.13/) (Sadiri Javadi et al., SoCon-NLPSI 2026)
ACL