This page lists the characters appearing in the Batman: Earth One line of comic books. All spoilers from the first two books will be unmarked below.
Batman / Bruce Wayne
The son of the murdered Thomas and Martha Wayne. He has become a vigilante in Gotham City.
- Adaptational Wimp: This Bruce Wayne never traveled the world to become a martial arts master, having learned everything from Alfred. He is also far from a master detective.
- Composite Character: He's the last living heir of the Arkham family in this universe, not unlike the character of Dr. Jeremiah Arkham.
- Heroic Wannabe: He starts out as this, but starts to grow out of it.
- Hero with Bad Publicity: He even has this as Bruce Wayne, at least in the eyes of Harvey Dent.
- Honor Before Reason: He won't wear body armor because of this.
- Irisless Eye Mask Of Mystery: Averted. Bruce's eyes and pupils are clearly drawn and are visible when he's in his cowl.
- Took a Level in Idealism: He isn't yet the jaded Vigilante Man just yet.
- You Killed My Father: His motivation.
A friend of the Wayne family who is Bruce's ally.
- Adaptational Badass: This version of Alfred plays up his military experience. He's also a bodyguard, not a butler.
- Badass Beard: Instead of the traditional pencil-thin mustache, this Alfred sports a beard.
- Battle Butler: Played with. He only calls himself Bruce's butler, but he isn't one.
- Big Damn Heroes: He saves Batman in Volume One near the end.
- Comic-Book Fantasy Casting: He resembles Christopher Lee in appearance.
- Handicapped Badass: This version has a fake right leg, after he lost his real one in battle.
- Old Soldier: A major part of this incarnation's character.
- Private Military Contractors: He was one in Seoul, Korea. His daughter lives there.
Killer Croc / Waylon Jones
A vagrant living in the sewers who has a rather severe skin condition.
- Adaptational Heroism: Killer Croc is a pretty decent guy here, if misunderstood. After being rejected and attacked by a world that judged him for his disfiguring illness, he retreated into the sewers. Chased there by hunters, he pre-emptively attacked any people he encountered. He eventually ends up saving Bruce from the Riddler, and joins Team Batman.
- Adaptational Wimp: Killer Croc applies to this, in the sense that he doesnt have a three-digit killing record like his original self. This version is basically just a normal human whos been put under extreme circumstances and sought out isolation rather than lashing out with murder.
- Artistic License Biology: Killer Croc tells Batman he suffers from ichthyosis, which is a family of genetic disorders that do cause scaly skin; Croc's condition, though, is not like any known cases— in particular, he appears to have bony plates on his brow, which doesn't happen.
- Body Horror: He's specifically played up as having a horrible skin disease rather than some bizarre mutation.
- My Greatest Second Chance: Killer Croc helps take down the Riddler after he realizes he could have saved countless lives if he stopped him early on.
The corrupt mayor of Gotham.
- Adaptational Attractiveness: Oswald Cobblepot may not be a good-looking man, but he's a damn sight better than the heavyset, and frequently disfigured Penguin of the mainstream comics. This makes sense, as he probably wouldn't have been elected mayor of Gotham with his canon appearance.
- Adaptational Badass: He's not terribly formidable in a fight (though he holds his own against Bruce), but the fact that he's the Mayor of Gotham means that he's much more dangerous here than in most other versions.
- Big Bad: of Volume 1.
- Comic-Book Movies Don't Use Codenames: He's never referred to as the Penguin.
- Corrupt Politician: Oh lord yes.
- Death by Adaptation: Alfred kills him in Volume 1.
- Death by Secret Identity: Dies after learning Bruce is Batman. According to Alfred in Volume 2, this is why he had to kill him.
- Faux Affably Evil: He's impeccably well-mannered, but it doesn't change the fact that he's a power-hungry psychopath.
- Insistent Terminology: About being called 'Mayor'.
- Jabba Table Manners: He's a rather messy eater.
- Mayor Pain: He runs the city like a mob operation.
- Mythology Gag: He wears "penguin suits".
- Adaptational Villainy: He's a Mad Bomber who wants to take control of the late Mayor Cobblepot's crime network, and in terms of riddles, he has none of his main counterpart's Honor Before Reason, lying about being willing to not kill a train full of people when Batman successfully solves one of his riddles.
- Big Bad: The main antagonist of Volume 2.
- Mad Bomber: His way of villainy is the use of bombs at locations of choice.
- Morton's Fork: Riddler tells Batman that he has to solve a riddle. If he doesn't, he'll blow up a train full of people, if he solves it, they live. He was lying, even when Batman answers correctly, he blew up the train anyway because he never expected Batman to answer correctly.
- No Shirt, Long Jacket: His attire of choice.
- Only Known by Their Nickname: Unlike his classic version, his name is never given, and the news reports state that it isn't known.
- Villainous Breakdown: In the final parts of Volume 2, Riddler undergoes a rather quick one, going from calm and confident as he kills people with his various tactics to screaming at Batman and trying to shoot him as soon as he finally catches up with him.
- Adaptational Attractiveness: Bullock has the looks of a Hollywood star, as opposed to the overweight disheveled mainstream version. By the time of Volume 2, he's beginning to look like his canon counterpart.
- Crouching Moron, Hidden Badass: He might look and act like a smug celebrity whose time has passed, but he makes damn sure that you remember he's still a trained cop.
- I Need a Freaking Drink: Seeing the dozens of bodies in Arkham Manor's basement has scarred Harvey deep, leaving him to seek refuge in the bottle.
- Nice Job Breaking It, Hero!: His attempts to reopen cases by using Gordon's name leads to the latter's daughter being kidnapped as punishment.