Nemotron-Personas-Belgium is a dataset of synthetic people from Belgium released in 2026 by NVIDIA in collaboration with Pleias and KU Leuven. It aims to comprehensively reflect the diversity and characteristics of the Belgian population, primarily to expand the diversity of sovereign AI synthetic data, mitigate data and model bias, and improve the diversity of model responses. This dataset contains 1.2 million records, each with 6 virtual character roles, totaling approximately 1.8 million character descriptions and about 1.9 billion tokens, of which 867 million tokens are character-related information. The data covers 581 Belgian municipalities and 3 administrative districts, containing approximately 260,000 unique names. It is available in four languages: Dutch, French, German, and English, with 300,000 records in each language version. This dataset is based on Belgian 2021 census data and 2025 population structure data. 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: cultural background, skills and expertise, interests and hobbies, gender, age, marital status, family type, education level, occupation code, industry type, and region and country of residence (fixed to Belgium).

Citation

@software{nvidia/Nemotron-Personas-Belgium,
author = {Delobelle, Pieter and Langlais, Pierre-Carl and Stasenko, Anastasia and Detrois, Yannick and Bendris, Meriem and Delfino, Benedetta and Prayaga, Shyamala and Sharabiani, Ashton and Sadeghi, Bardiya and Jennings, Will and Praveen, Kiran and Van Segbroeck, Maarten and Corneil, Dane and Meyer, Yev},
title = {{Nemotron-Personas-Belgium: Synthetic Personas Aligned to Real-World Distributions for Belgium}},
month = {June},
year = {2026},
url = {https://huggingface.co/datasets/nvidia/Nemotron-Personas-Belgium}
}