I'd like him to be a playboy as Bruce Wayne, but with some semblance of a good heart and trauma even in his public persona. Maybe a bit of an *******, he flirts with every hot girl that exists, he parties all the time and has weird manipulative relationships with all the people in his Bruce Wayne persona, but he still gives away a good chunk of money to charity, he's a reasonable person you can get along with.
Not a complete facade like Bale. Something more nuanced and interesting. But not as uptight/dorky as Keaton.