Due to their popularity and dissemination, multiplayer online battle arena games (MOBAs) are a relevant stage for novel user experience and behavior forms. One example is toxic behavior (or toxicity in short), an umbrella term for negative player behavior during games. TB is currently considered one of the biggest challenges in MOBAs (such as League of Legends), leading to a diminished gaming experience and significant player churn. Despite some isolated attempts, empirical research to better understand toxicity still needs to be completed. Accordingly, it is so far unclear which personality traits promote the emergence of toxicity. To answer this question, we propose a study to better understand the relationship between anger, aggression, and the Big Five as antecedents of toxicity. As a methodological framework, we plan to use a survey and covariance-based statistics to derive the results of our study.