Trevor Eve doesn't get that much to do as Jonathan, from what I recall. He only wrote to Dracula, and never met him until he washed ashore in England. I recall many screams from Jonathan, in terror whenever there was danger, of "PROFESSOORRRR!"

(And one vaguely amusing moment as Jonathan let himself into Carfax with a key he still had, and startled Dracula when he thought he was all alone.)