Val Kilmer is an acclaimed Hollywood actor (a.k.a. the man who was The Bat) operating in Gotham City. Unlike Willem Dafoe, Danny DeVito, Brendan Fraser or Debra Messing, Kilmer is not commonly used as an actor for movie pitches, but rather as either Batman or as a way to enrich Jonathan Holmes' life further by including him in Jim Sterling's ideas.
Val Kilmer has 'officially' given Jonathan Holmes the use of his name for his many "Val Kilmer Presents" projects, which Val Kilmer himself may or may not attend.
Val Kilmer transfers his soul to every actor who plays the Batman, so Val Kilmer always is the Batman.