This is a complete crack idea. However: dp/dc au where Danny is Alfred. He found out that he is 1) Immortal and 2) can shapeshift and he's just been randomising his customisation settings ever since. When he goes into butler work for the Waynes he decides to be as stereotypical as possible figuring it'll be really funny for the few years he works for them, and the bit is indeed Very Good- right up until their son gets orphaned. It's been 30 years and now the bit is just his life.