While informal institutions significantly affect the functioning of courts, they also change the powers, position, and influence of individual actors in judicial systems. This Article analyzes how the presence of informal judicial institutions and practices reshapes the influence and importance of roles individual actors play in the functioning of the judiciary. The aim of this Article is three-fold. First, it maps the actors of informal judicial institutions and practices. Second, it stresses the importance of looking at actors who are not formally involved in particular judicial processes and recognized as decision-makers but have the ability to influence the judiciary informally. Third, it shows why it is necessary to keep in mind that also collective bodies can take part in informal judicial institutions and practices.