Caribbean coral reefs have experienced extensive coral loss, often accompanied by increased algal cover and reduced resilience. Restoration efforts increasingly focus on enhancing native herbivores populations, including the Caribbean king crab (Maguimithrax spinosissimus), which can reduce macroalgal cover and promote coral recruitment. However, the ecological consequences of increasing M. spinosissimus densities for other native herbivores remain uncertain, as this species is an omnivore. We experimentally quantified interaction frequency, interaction duration, and feeding frequency between M. spinosissimus and three native herbivores (Diadema antillarum, Tripneustes ventricosus, and Cittarium pica) to assess potential predation and non-lethal interference. M. spinosissimus interacted frequently with all herbivores, though lethal interactions were rare. Interactions with D. antillarum and T. ventricosus were often prolonged and involved repeated handling, but typically resulted in partial feeding or abandonment rather than full consumption. In contrast, C. pica was largely resistant to predation due to effective natural defenses. Interaction and feeding frequencies with D. antillarum declined with increasing crab carapace width, whereas interactions with T. ventricosus and C. pica were consistent across crab traits. Substantial among-individual variation revealed consistent differences in crab interaction tendencies. These results indicate that high interaction rates do not translate into strong feeding effects, suggesting that M. spinosissimus functions as a behaviorally interactive but weak top-down predator. Nevertheless, frequent non-lethal interactions may alter herbivore behavior and grazing efficiency through interference. Behavioral compatibility among native herbivores should therefore be considered in reef restoration planning, and field studies are needed to evaluate these interactions under natural conditions.