List of Beware the Batman characters

• Bruce Wayne / Batman (voiced by Anthony Ruivivar) is the title character of the series; a troubled but highly intelligent and strong-willed wealthy socialite who uses his abundance of skills and resources to moonlight the city of Gotham as a bat-themed vigilante after witnessing the deaths of his parents. Mitch Watson, co-producer of Beware the Batman, explained how the crew behind the series approached Batman for the show the way they did: "In the way we approached Batman for this show, he's at the beginning of his career, he's probably been doing it for about five to six years, he's in his early 30s. And character-wise, we broke him into three parts. There's the public Bruce Wayne, who we modeled slightly after Richard Branson. We wanted to make Bruce Wayne more of an altruistic guy and the company's (Wayne Enterprise) trying to do good. So, that's the public Bruce. The private Bruce is more introspective guy who really only deals with Alfred, and Alfred at the beginning of the series is really the only person who sees that side of Bruce Wayne. He's quiet; he's a little bit obsessive about particular things".^[1] Developers expressed that the series is a departure from previous Batman animated series in their choice to focus on the character's nature as a detective and focusing on his intellect. Crime fighting in the series puts emphasis on procedural aspects of mystery solving. Batman is also a subject to external threats of injury, as Watson said that there are several episodes where he really gets damaged.^[2]
• Tatsu Yamashiro / Katana (voiced by Sumalee Montano) is a martial arts swordmaster in hiding from the League of Assassins who was hired to act as Bruce Wayne's bodyguard by her godfather Alfred Pennyworth. She revealed to Alfred that she was undercover in the League of Assassins to steal the Soultaker Sword from them before it can be used for their own evils.
• Alfred Pennyworth (voiced by JB Blanc) is a former MI6 agent and Bruce Wayne's butler. Following initial promotion of the series, critics were concerned with what they interpreted to be the re-characterization of Alfred Pennyworth as a fellow crime fighter. Producer Glen Murakami explained that initial promotion posters that had been issued to the press were not originally intended for release, and that they did not give an accurate display of Alfred's role in the show. However, Murakami referred to Alfred's canonical backstory, which cast Alfred as a former MI6 agent, and said that this would be Alfred's portrayal in the show. Series writer Mitch Watson described this version of Alfred as Sean Connery from The Untouchables. The characterization of Alfred is that of a man who was once in a physical condition on par with Batman, who was now in his 60s and past his prime, but still is able to provide advice to Batman and be an ally when necessary. This characterization was pitched to DC comics, who responded that the company was coincidentally also taking Alfred in that direction. Series developers originally intended to give Alfred a greater role in the series, but Murakami advised that they scale back his activities, over concern that he could outshine Batman.^[3]
• Commissioner Jim Gordon (voiced by Kurtwood Smith) is a police lieutenant who works fore the Gotham City Police Department. Although he disapproved of Batman's crime-fighting, he slowly became an ally of Batman. He is later promoted to police commissioner during the second half of the first season after Commissioner Correa is killed by ninjas working for the League of Assassins.

When the series was first unveiled, lesser-known villains were introduced. Sam Register explained that they went deeper into the villain library, as the studio did not want the series to do another "Joker story".^[4][5][6] The following villains are listed in order of appearance:

• Anarky (voiced by Wallace Langham) is a mysterious figure who self-identifies as a madman and champion of chaos in opposition to Batman, who he sees as the champion of law and order. Whereas the original character is an anti-villain thematically based on socio-political philosophy, producers chose Anarky to function as the main villain, and was re-characterized as a criminal mastermind who would challenge Batman through complex schemes and machinations.^[7] In the closing credits of "Tests", the creation credits for Anarky and Katana were swapped, thus erroneously crediting Mike W. Barr and Jim Aparo for creating him.
• League of Assassins is a secret international criminal organization consisting of highly trained warriors.
  • Ra's al Ghul (voiced by Lance Reddick) is the leader of the League of Assassins. Ra's first appears in suspended animation until he is revived by Lady Shiva.
  • Sandra Wu-San / Lady Shiva (voiced by Finola Hughes) is an elite member of the League of Assassins.
  • Silver Monkey (voiced by James Remar) is an elite agent of the League of Assassins who wears a monkey-based mask.
  • Avery Twombey / Cypher is a cyborg agent of the League of Assassins.
• Slade Wilson / Deathstroke (voiced by Robin Atkin Downes) is an elite mercenary who is hired by Harvey Dent and Anarky to hunt down Batman.
• Harvey Dent (voiced by Christopher McDonald) is a district attorney who is obsessed with bringing Batman down. He eventually gains his own assault squad and is shown to be very deceptive. Following an accident where his head is covered in bandages, Dent's bad side starts to surface and he becomes Two-Face.
• Lazlo Valentin / Professor Pyg (voiced by Brian George) an eco-terrorist, thematically inspired by The Wind in the Willows.
  • Mister Toad (voiced by Udo Kier) is Professor Pyg's henchman. In this series, Toad fights with a wooden cane that conceals a flamethrower.
• Margaret Sorrow / Magpie (voiced by Grey DeLisle-Griffin) – Magpie, a character created in the 1980s, underwent a massive redesign to give her a more contemporary appearance.^[3] She gained poisonous claws and an inability to feel pain after an experiment intended to purge her kleptomaniac tendencies in return for a reduced sentence at Blackgate Penitentiary. However, her memories were altered with the new identity of "Cassie", while Margaret's darker aspects manifested as a second personality called Magpie. Magpie also harbors a romantic obsession with Batman, which the latter does not reciprocate.
• Tucker Long / Junkyard Dog (voiced by Carlos Alazraqui) – Junkyard, along with his friend and fellow artist Doodlebug, were detained by Batman but were freed by Anarky and recruited by him to sow chaos and destruction. Though Anarky supplied them with progressively destructive equipment, the two were eventually defeated and arrested once again.
• Daedalus Boch / Doodlebug (voiced by Arif S. Kinchen) – Doodlebug, along with Junkyard Dog, is hired by Anarky to sow chaos and destruction.
• Tobias Whale (voiced by Michael-Leon Wooley) an African American albino crime boss.
  • Milo Match / Phosphorus Rex (voiced by Greg Ellis) is Tobias Whale's lawyer. As Phosphorus Rex, he serves as his pyrokinetic chief enforcer. The original comic book counterpart to this character is a member of the Circus of Strange (the same criminal organization that Professor Pyg and Mister Toad are members of) and his real name was unrevealed.
• The Ghosts are a small-time criminal group residing in a part of Gotham City called the Cauldron (which used to be a thriving industrial park).
• Humphry Dumpler / Humpty Dumpty (voiced by Matt L. Jones) is a former mob accountant who developed a childlike personality due to a missile blasted at him and or Commissioner Gordon presumably from Tobias Whale. He is obsessed with the nursery rhyme of the same name and committed crimes using toy soldiers wielding real weapons.
• Key (voiced by JB Blanc) is a criminal who can mold his fingers into any key to fit the locks and is able to download digital security keys from computers into his brain.
• Killer Croc (voiced by Wade Williams) is a crocodile-like criminal known as the "King of Blackgate Prison". Following his fight with Batman, Killer Croc moved his criminal activity to the sewers.
  • Matatoa (voiced by Michael-Leon Wooley) is a killer covered in tribal tattoos who wields daggers and is allegedly immortal after eating his victims' hearts to absorb their life force.
• The Council is an organization that captured Paul Kirk.
  • Doctor Anatol Mykros (voiced by Bruce Thomas) is the leader of The Council.

• Barbara Gordon / Oracle (voiced by Tara Strong) is the daughter of James Gordon who has a continuing interest in Batman, and later, Katana.
• Madison Randall (voiced by Sumalee Montano) is a female news anchor that works for Gotham News.
• Simon Stagg (voiced by Jeff Bennett) is a businessman who is the CEO of Stagg Enterprise. He is also responsible for turning Rex Mason into Metamorpho.
• Sapphire Stagg (voiced by Emmanuelle Chriqui) is Simon Stagg's daughter and co-owner of his business.
• Michael Holt (voiced by Gary Anthony Williams) – Holt is a businessman who was hunted by Professor Pyg and Mister Toad.
• Dr. Bethanie Ravencroft (voiced by Cree Summer) is a psychologist who formerly experimented on rehabilitating criminals including Magpie. Bethanie has repeatedly tried to get Bruce Wayne to join the Argus Club. She was later revealed to be in league with Silver Monkey and ends up having her soul drained by Lady Shiva using the Soultaker Sword.
• Lunkhead (voiced by JB Blanc) is a thug who possesses superhuman strength. He was also part of an experiment in Blackgate Penitentiary involving mind control along with Magpie, which proved unsuccessful.
• Dr. Jason Burr (voiced by Matthew Lillard) is a scientist who worked on the Ion Cortex, which was targeted by the League of Assassins.
• Officer O'Brien (voiced by Michael Patrick McGill) is a police officer who works at Gotham City Police Department under Lt. James Gordon.
• Rex Mason / Metamorpho (voiced by Adam Baldwin) was a security guard for Stagg Enterprises who was caught having a relationship with Simon Stagg's daughter, Sapphire. Infuriated, Stagg lured him into a chamber which transformed him into Metamorpho, an elemental shapeshifter.
• Marion Grange (voiced by CCH Pounder) is the Mayor of Gotham City who first appears in "Nexus". Following the incident with Humpty Dumpty, Grange resigns from office and David Hull is sworn in as the new Mayor of Gotham City.
• Dr. Kirk Langstrom / Man-Bat (voiced by Robin Atkin Downes) is a scientist who was working on bat DNA to find a cure for an unknown disease. Professor Pyg and Mister Toad held Langstrom at gunpoint and forced him to use the bat DNA formula on himself, transforming him into Man-Bat.
• David Hull (voiced by James Patrick Stuart) – He first appeared as the deputy mayor for Marion Grange. After Grange steps down following the incident with Humpty Dumpty, Hull is sworn in as the new Mayor of Gotham City.
• Paul Kirk / Manhunter (voiced by Xander Berkeley) is a secret agent and a former hostage of the Council, which used him to create a small army of non-organic Manhunter clones.
• Ava Kirk (voiced by Tisha Terrasini Banker) is a renowned doctor, daughter of Paul Kirk, and a love interest for Bruce Wayne.
• Jocelyn Kilroy (voiced by Beth Tapper) is the head of Gotham's CDC department who tried to prevent an outbreak, even if it meant the death of Batman and Katana. She later runs for mayor until Two-Face and Anarky intimidate her into quitting.