With increased digitalization and new technologies, societies are expected to no longer only include human actors, but artificial actors as well. Such a future of societies raises new questions concerning the coexistence, tasks and responsibilities of different actors. Manifold disciplines are involved in the creation of these future societies. This requires a common understanding of responsibility, and of definitions of actors in Hybrid Societies. This review aims at clarifying aforementioned terms from a legal and psychological perspective. Building from this common ground, we identified seven capacities in total which need to be met by actors in societies to be considered fully responsible, in both a legal and moral sense. From a legal perspective, actors need to be autonomous, have capacity to act, legal capacity, and the ability to be held liable. From a psychological perspective, actors need to possess moral agency and can be trusted. Both disciplines agree that explainability is a pivotal capacity to be considered fully responsible. As of now, human beings are the only actors who can, with regard to these capacities, be considered morally and legally responsible. It is unclear whether and to which extent artificial entities will have these capacities, and subsequently, whether they can be responsible in the same sense as human beings are. However, on the basis of the conceptual clarification, further steps can now be taken to develop a concept of responsibility in Hybrid Societies.