Nemotron-Personas-Japan is a dataset of synthetic human figures released by NVIDIA in 2025. It aims to showcase the diversity and richness of Japan's population and is primarily used to support the development of sovereign AI systems, training of large language models, and to reduce bias in synthetic data. This dataset contains 1 million records, each with 6 virtual characters, totaling approximately 6 million character descriptions and about 1.4 billion tokens, of which 850 million tokens are related to the characters. The data covers all 47 prefectures of Japan, more than 1,500 occupational categories, and more than 950,000 unique names. The dataset was generated based on official Japanese demographic data, geographical distribution, and personality trait distribution. All characters are completely virtual and do not correspond to any real personal identity information. Data on minors under the age of 18 has also been excluded. Data Fields: The dataset contains 22 valid data fields (excluding UUID), divided into 6 personality attribute fields and 16 demographic feature fields:

• Character attribute fields: covering occupation profile, sports hobbies, artistic talents, travel preferences, dietary habits, and overall personality.
• Demographic characteristics fields include: skills and expertise, interests and hobbies, career goals, gender, age, language, marital status, education level, occupation type, and region and country of residence (fixed to Japan).

Citation

@software{nvidia/Nemotron-Personas-Japan,
author = {Fujita, Atsunori and Gong, Vincent and Ogushi, Masaya and Yamamoto, Kotaro and Suhara, Yoshi and Corneil, Dane and Meyer, Yev},
title = {{Nemotron-Personas-Japan}: Synthetic Personas Aligned to Real-World Distributions},
month = {September},
year = {2025},
url = {https://huggingface.co/datasets/nvidia/Nemotron-Personas-Japan}
}