Should appear in... Batman: Arkham City
Anything a Batman can do, an actual Bat can do better. Aero can run, jump, glide, dive attack, dive attack upwards, and unlike Batman, his wings are never going to fray after a long night's busting heads. In the original SNES and Mega Drive game, his mission objectives even included diving through mid-air hoops and smashing up arbitrary bits of the environment.
Consider the facts that his throwing stars are nothing if not proto-batarangs, he fights circus-themed enemies, and that he has an annoying, animal-named sidekick in the form of Zero the Kamikaze Squirrel and it's quite clear that the Arkham games are just one big rip-off of Aero's 1993 adventure.