Pass a variable between two actors

Development Pipeline & Plugins Editor Scripting
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2

OnOverlap delegate already keeps other actor in function variables.

For that purpose you should do.

MainSphere->OnComponentBeginOverlap.AddDynamic(this, &AClassName::FunctionName);

Here is the definition of ComponentOverlap in PrimitiveComponent.h

DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_SixParams( FComponentBeginOverlapSignature, UPrimitiveComponent, OnComponentBeginOverlap, UPrimitiveComponent*, OverlappedComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, int32, OtherBodyIndex, bool, bFromSweep, const FHitResult &,SweepResult);

Based on above signature macro your function (imagining its Actor) you should have function like this :

void AClassName::FunctionName(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult)
{
 if (OtherActor != nullptr)
 {
     AActor myActor = Cast<AYourPlayerClass>(OtherActor);
     if (myActor)
         myActor->DoSomething()
 }
}

At here other actor is the actor actually overlapping with this actor. So you will cast it to your main character.

If you have further questions dont hesitate to ask me.