The sense of agency varies as a function of arousal and valence in negative affect but is the same true for positive affect? Moreover, will inter-individual characteristics predict those effects? Temporal binding, an implicit measure of the sense of agency, was determined in 59 participants before and after watching a positive film clip with either high or low arousal compared to a neutral clip. Analyses included participants’ subjective affective ratings, physiological arousal (pupillometry, skin conductance, heart rate), and individual differences (arousal reactivity via psychopathy, eyeblink rates). Linear mixed models showed low arousal reactivity lessened the effect of high arousal on binding towards actions and facilitated an effect of low arousal on binding towards actions. Low arousal reactivity reversed the effects of high arousal on binding towards outcomes. These results provide evidence that individual differences influence the extent to which the sense of agency is affected by positive affect.