Abstract: The present inventor recognized that children's interest in conventional water rockets can wane rapidly over time, particularly as children are drawn to other types of toys, such as video games. Accordingly, the present inventor devised, among other things, one or more exemplary water rocket systems or assemblies that include a removably mounted action figure. In some embodiments, the water rocket includes two hollow fuselage structures joined via a crossbar structure, with the action figure mounted to the crossbar structure.