# Introduction The new framework for online dynamics simulation based on user personality was launched today. PRISM (Personality-Refracted Intelligent Simulation Model) is an innovative system that combines stochastic differential equations (SDEs) for continuous emotional evolution with a partially observable Markov decision process (PC-POMDP) for discrete decision-making. This framework assigns distinct Myers-Briggs Type Indicator (MBTI)-based cognitive policies to multimodal large language model (MLLM) agents, initialized via data-driven priors from large-scale social media datasets. PRISM achieves superior personality consistency aligned with human ground truth, significantly outperforming standard homogeneous and Big Five benchmarks. This tool effectively replicates emergent phenomena such as rational suppression and affective resonance, offering a robust tool for analyzing complex social media ecosystems.