Lara wins. It was Mogo.
Also, Lock Jaw, only one of the first four clues was broad/general, which was the first one.
Not terribly many characters in the DCU have been prophesied about AND have been members of a law enforcement organisation. Mogo was prophesied as being the last of the Green Lanterns, before being killed by the Sentient City. "Mogo Doesn't Socialise" was the name of the first arc he was introduced in - that's pretty specific too, even though I didn't hint that it was anything more than just a straight clue. Finally, he is the biggest member on the force - that's not broad, that's downright specific. Don't be bitter because you don't know your Green Lanterns
Lara's go.