Inside the parent node "Node2D", I have the following nodes:

I want to detect when Willow's CollisionShape2D enters the interact box Area2D, as well as when it exits the area. I've tried using _on_Interactor_body_entered and _on_Interactor_body_entered without success. I want to make sure I'm only detecting when the player enters the area, not any other body that might exist later on ( otherwise I could just do get_overlapping_bodies.empty() ). How could I do this?

    Interact is a plain Node?

    Is there a reason for using this structure:

    Interact
.... Interact box
.... Sprite

    instead of:

    Interact box
.... Sprite

    Connecting the Area2D's body_entered signal to the signal handler method should detect when the KinematicBody2D enters the Area2D. The signal's parameter body tells you which node entered the Area2D.
    https://docs.godotengine.org/en/stable/classes/class_area2d.html#signals

      DaveTheCoder What do you mean by signal handler method?
      Also, I should clarify that the Interactor is an instance of it's own scene, where it has a CollisionShape2D as a child. Whatever setup I do would need to work for any instance of the Interactor, preferably without additional setup once the instance is created.

          MouldyCheese I've tried using _on_Interactor_body_entered

          Can you clarify that? Is that a function? Is a signal connected to it?

          MouldyCheese What do you mean by signal handler method?

          A signal has to be connected to a function (method), which is called when the signal is emitted, and handles the signal. An alternative is to call yield() to wait for the signal.
          https://docs.godotengine.org/en/stable/getting_started/step_by_step/signals.html