why 2d platformer "Foot effects" is not in Character prefab?

hello

i am trying to understand the 2d plataformer project.

I noticed that in the Character (Lertz) prefab we only have access to the rootJoint.

But if we instanciate a Character(Lertz) in the Hierarchy we see that some scripts are attached to the joints (Foot Effects for example).

Why "Foot Effect" doesnt appear in the Charactert Prefab ? (if i drag the prefab in the Hierarchy those scripts are there by magic)

Thanks