The present study investigated the relationship between the Light and Dark Core of personality and self-reported adherence to COVID-19 containment measures. A gender-balanced representative sample of 600 Slovaks participated in the study. We formulated a mediation model, hypothesising that the relationship between Light and Dark Core and self-reported adherence is mediated by the motivation to comply with the measures. The results of structural equation modelling showed that self-reported adherence was positively related to the Light Core and this relationship was also mediated by motivation. The Dark Core, in turn, showed a negative relationship with the adherence, while no mediation was found. Importantly, the findings of both Light and Dark Core models remained robust after including trust in government. The present study contributes to theory by providing first results corroborating the existence of Light Core of personality. The findings of this study can also help to better shape the communications about containment measures to address both individuals with high levels of benevolent and malevolent traits.