Ace the Bat-Hound is a fictional superhero dog appearing in American comic books published by DC Comics. He is commonly featured as the canine crime-fighting partner of Batman and currently the sidekick of Streaky and Krypto.
This is going off the debut of comic book characters. In the cases of characters who were introduced in other media originally and added to the comics canon later along (ex: Harley Quinn) it'll go by actual debut year.
