Dick Grayson become's Nightwing and also Red Robin in an alternate reality I think.
Barbara Gordon is Batgirl.
Do anymore of Batman's friends/allies become superheroes?
Off the top of my head (and I'll expand this list as I find them):
There are also a substantial number of heroes who were recruited and supported by Batman, despite having existed independently before his involvement, and several hero-esque characters who never adopted superhero identities, like Alfred or Lucius Fox or Jim Gordon.
And, of course, out-of-universe, there are probably hundreds of heroes who were created for Batman storylines, without having been created by Batman/Wayne in-universe.