Raycast and Debug Line Position

If you child an empty game object to the character at the desired position, this will work - but you must set the raycast origin at this object! Supposing that the empty object is named "Head":

 private var head: Transform;
 
 function Start(){
   head = transform.Find("Head"); // get a reference to "Head"
 }

The raycast may be done like this:

 // cast a ray from head.position in the parent's forward direction:
 if (Physics.Raycast(head.position, transform.forward, hit){
     // something was hit
 }

Another possibility is to define the offset in a float variable:

 var offset: Vector3 = Vector3(0, 0.9, 0); // offset from transform.position

Do the raycast like this:

 if (Physics.Raycast(transform.position + offset, transform.forward, hit)){
     ...