You may be looking for one of the following:

* CastingGag: An entire role mirrors or parodies an entire previous role or real life situation of the actor.
* RealLifeRelative: When two or more characters in a show are played by actors who have some form of real-life relationship.
* JustForFun/RoleAssociation: A JustForFun game for inserting an actor's roles from one work into another work.
* ThoseTwoActors: When two actors are regularly cast together for the sake of audience appeal.
* {{Typecasting}}: An actor's characters frequently share in-universe traits and/or roles.

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