This book constitutes the proceedings of the workshops co-located with the 19th International Conference on Practical Applications of Agents and Multi-Agent Systems, PAAMS 2021, held in Salamanca, Spain, in October 2021. The total of 17 full and 9 short papers presented in this volume were carefully selected from 42 submissions. The papers in this volume stem from the following meetings:Workshop on Character Computing (C2); Workshop on Deep Learning Applications (DeLA); Workshop on Decision Support, Recommendation, and Persuasion in Artificial Intelligence (DeRePAI); Workshop on Multi-agent based Applications for Modern Energy Markets, Smart Grids and Future Power Systems (MASGES); Workshop on Smart Cities and Intelligent Agents (SCIA).