List of DC Comics characters: J

Jack the Ripper is a fictionalized version of a real-life serial killer. The character, created by Brian Augustyn and Mike Mignola, first appeared in Gotham by Gaslight #1 (February 1989). Jacob Packer had been trained in both medicine and law by Thomas Wayne but Martha Wayne rejected him. Packer hired an assassin to kill the two and afterwards personally killed women to silence his own insanity. Jack the Ripper frames Bruce Wayne for his killings in Gotham City. A trial is held in which Packer was a defense attorney, however, Bruce was convicted, sentenced to be hanged and imprisoned in Arkham Asylum but eventually figures out the killer's identity and escapes from prison with Alfred Pennyworth's help. Batman confronted Jack the Ripper throughout Gotham and the two eventually come to the graves of Thomas and Martha before he was killed by Inspector James Gordon.^[1]

Jack the Ripper, amalgamated with James Gordon, appears in Batman: Gotham by Gaslight, voiced by Scott Patterson. Additionally, Jacob Packer makes a non-speaking cameo appearance.^[2]

Aubrey James is a fictional character appearing in American comic books published by DC Comics.

Aubrey James was the mayor of Gotham City and a friend of Thomas Wayne prior to Thomas' murder. He was later stabbed to death as mentioned in The Madmen of Gotham.^[3]

Aubrey James appears in Gotham, portrayed by Richard Kind.^[4] This version is shown to have a connection with Carmine Falcone and tends to get targeted by different criminals.

Java is a fictional character appearing in American comic books published by DC Comics.

Java is the Neanderthal servant of Simon Stagg. He was first discovered by fortune hunter Rex Mason and revived by the scientific wizardry of Stagg Enterprises. Java is present when Mason discovers the Orb of Ra in Egypt and is transformed into Metamorpho.^[5] Java pines for Simon's daughter Sapphire Stagg, but is unable to win her heart because she is in love with Metamorpho.^[5]

During a time when Metamorpho was believed to be dead, Sapphire relented to Java's persistent advances and married him. Java became the father figure to Sapphire and Rex's mutant son, Joey. Java was not an inherently evil individual, but his moral base had been compromised due to his constant exposure to the unscrupulous Simon Stagg. He was also extremely selfish when it came to his wants and desires. When Rex abducted Joey from Stagg Mansion, Java flew into a rage and was determined to kill him. Frustrated by Java's defiance, Simon Stagg shot and killed him.^[6] However, Java is later seen alive attending the funeral of Metamorpho, who was believed to be dead.^[7]

During the "Brightest Day" storyline, Java was with Simon Stagg at his Canadian estate when Metamorpho persuaded him to help him and the Outsiders get back into the United States. Later that night, Java kidnaps Metamorpho and attempts to fuse him with Chemo. However, the process goes awry, forcing Java to call in Stagg's servant Freight Train to stop Chemo.^[8][9] Later, Stagg performs an unidentified experiment that transforms Java into a Shaggy Man. However, he is defeated by Freight Train, who had since joined the Outsiders.^[10]

In 2011, "The New 52" rebooted the DC universe. Java's history with Simon Stagg and Rex Mason remains the same.^[11]

Java was present when Simon Stagg opened a portal to the Dark Multiverse and tried to close it with Metamorpho, who had transformed into Nth Metal.^[12] He is present when Mister Terrific, Plastic Man, Metamorpho, and Phantom Girl return from the Dark Multiverse.^[13]

Later, Java is revealed to have been operating as the villain Doctor Dread and forms a counterpart of the Terrifics called the Dreadfuls. They were defeated by the Terrifics.^[14]

• Java appears in the Justice League episode "Metamorphosis", voiced by Richard Moll.^[15]
• Java appears in The Flash episode "Fastest Man Alive", portrayed by Michasha Armstrong. This version is a contemporary African-American human and Stagg Enterprises' head of security who is killed by Multiplex.

The Javelin is a fictional DC Comics supervillain.^[16]

The Javelin is a former German Olympic athlete who turned to a life of crime, using his uncanny abilities with a javelin-based weapons arsenal. The Javelin fought Green Lantern and was defeated before agreeing to serve with the Suicide Squad in exchange for the purging of his criminal record. His last Squad mission was a battle with Circe as part of the War of the Gods crossover event. It takes place in issue #58.

In the pages of Checkmate, the Javelin is recruited by the Mirror Master in an attempt to frame Amanda Waller. He teams up with several other villains, such as Plastique and the duo Punch and Jewelee. They invade a Myanmar military facility to neutralize what seems to be a superhuman power source. The Javelin is killed by a runaway jeep while trying to protect a distraught, newly widowed Jewelee.^[17]

• The Javelin makes non-speaking cameo appearances in Justice League Unlimited as a member of Gorilla Grodd's Secret Society.
• The Javelin makes a non-speaking cameo appearance in the Batman: The Brave and the Bold episode "Scorn of the Star Sapphire!".
• A character loosely inspired by the Javelin named Malcolm Byrd appears in the Arrow episode "The Demon", portrayed by Yanik Ethier. This version is a French arms dealer associated with the Ninth Circle.
• Gunter Braun / Javelin appears in The Suicide Squad, portrayed by Flula Borg.^[18] He is recruited into the eponymous group for a mission to Corto Maltese, but is fatally wounded by the local military and bequeaths his namesake to teammate Harley Quinn.

Jefferson Jackson is a supporting character of Ronnie Raymond (a.k.a. Firestorm) who makes his debut in Firestorm (vol. 2) #1 (June 1982). Jackson is a former student of Bradley High School in Manhattan, New York. During his tenure at Bradley High, Jackson became a member of the school's championship basketball team, where he met Ronnie. The two became close friends, and Jackson frequently aided Ronnie during the numerous episodes wherein the latter would find himself embroiled in conflicts with school jerk Cliff Carmichael. Jackson dated a young woman named Stella, and the two frequently double-dated with Ronnie and his girlfriend, Doreen Day.

Jefferson "Jax" Jackson appears in media set in the Arrowverse, portrayed by Franz Drameh.^[19][20]

• First appearing in the live-action TV series The Flash episode "The Fury of Firestorm", this version is a former high school football player who was injured when S.T.A.R. Labs' particle accelerator exploded and was forced to become a mechanic instead. Following Ronnie Raymond's death and due to Martin Stein's F.I.R.E.S.T.O.R.M. matrix destabilizing, the Flash and his allies find and recruit Jax to save Stein and become the new Firestorm as all three were similarly affected by the particle accelerator.
• Jax appears in the second-season premiere of the animated web series Vixen.^[21]
• Jax appears in the live-action TV series Legends of Tomorrow. In the first season, Rip Hunter recruits him and Stein to join his Legends and help defeat Vandal Savage. Despite Jax refusing and Stein bringing him against his will, the former grows to appreciate being part of a team. In the second and third seasons, Stein inadvertently changes the timeline and gives himself a daughter, who goes on to have a son named Ronnie. In light of this, Jax asks his teammate Ray Palmer for help in developing a formula to separate the F.I.R.E.S.T.O.R.M. matrix so the former can use Firestorm's power on his own and allow Stein to be with his family. In "Crisis on Earth-X", Stein is fatally injured while helping the Legends and Earth-1's heroes combat Nazis from Earth-X, but drinks Palmer's formula to save Jax from suffering his fate, sacrificing himself in the process. A distraught Jax leaves the Legends to heal from his grief, though a future version appears in the third-season finale to help them defeat Mallus.

Virginia "Jinny" Hex is a fictional DC Comics superheroine. She is the granddaughter of Jonah Hex and a member of Young Justice. She first appeared in Batman Giant #4 (December 2018).

M'yrnn J'onzz is the father of the twin brothers J'onn J'onzz/Martian Manhunter and Ma'alefa'ak. His first appearance was in Martian Manhunter (vol. 2) #3 (August 2001).^[22]

M'yrnn J'onzz appears in Supergirl, portrayed by Carl Lumbly.^[23] This version was captured by the White Martians and coerced into revealing the location of the Staff of Kolar, a psychic weapon believed to be the key to ending a war. After being rescued by Supergirl, Martian Manhunter, and Miss Martian and taken to live in National City on Earth, M'yrnn develops a form of dementia before sacrificing himself to stop Reign from terraforming Earth. In subsequent seasons, M'yrnn appears as a spirit and in flashbacks.

Rhea Jones is a fictional character appearing in American comic books published by DC Comics.

Rhea Jones was the daughter of an Air Force official. After tagging along with her father to a government base in the Arctic, an explosion involving a powerful radioactive electromagnet killed her father and granted her electromagnetic abilities. Subsequently, she ran away and joined a circus to avoid being experimented on by the army. After a few years, Rhea was recruited by Arani Caulder to join her new Doom Patrol.^[24]

After being recruited by Arani Caulder / Celsius, Rhea was now one of three new recruits into the Doom Patrol, along with Scott Fischer and Wayne Hawkins aka Karma. Celsius gave her the codename Lodestone. Her demonstrated abilities allowed her to fly, give herself Earth reinforced superstrength, create limited force fields, and attract or repel metallic objects like bullets.

Following the Invasion! storyline, Rhea and Scott were struck by a disease created by the Dominators. This ultimately killed Scott while Rhea lost control of her powers and fell into a coma.

At the start of Grant Morrison's run of Doom Patrol, Rhea was rendered comatose again while undergoing a metamorphosis that eventually gave her enhanced electromagnetic abilities.

After ending the conflict between the Orthodoxy and the Geomancers (with help from Rebis and Robotman), Rhea pointed out a bright star in the sky, and left to go visit it. Promising to visit, she has not been seen since.^[24] Her only subsequent appearance to date has a brief flashback to her early days with Arani Desai and Valentina Vostok when the two returned during Blackest Night.^[25]

• Rhea Jones makes a cameo appearance in the Batman: The Brave and the Bold episode "The Last Patrol!" as part of a poster advertising a carnival's freak show.
• Rhea Jones / Lodestone appears in the Doom Patrol episode "Doom Patrol Patrol", portrayed by Lesa Wilson as a young woman and an uncredited actress as an old woman. This version was a member of a 1950s incarnation of the Doom Patrol before they were defeated by Mr. Nobody and disbanded. As most of the team were left mentally ill following the battle, Joshua Clay became their caretaker.

Tao Jones is a fictional character appearing in American comic books published by DC Comics.

She was among the children who were experimented on by Doctor Love while they were still in their mother's womb, causing her to develop the ability to generate force fields. She becomes a member of Helix and an enemy of Infinity, Inc.^[26]

Tao Jones appears in the Stargirl episode "Frenemies – Chapter Eight: Infinity Inc. Part Two", portrayed by Andi Ju. This version is a patient at the Helix Institute for Youth Rehabilitation partnered with Kritter.

Jumpa is a fictional character appearing in American comic books published by DC Comics.

On Earth-Two, Jumpa is a Kanga, a flying kangaroo-like creature and friend of Wonder Woman who serves as her mode of transportation on Themyscira.^[27]

In Infinite Frontier, a flashback to Wonder Woman's childhood had her working to train Jumpa while riding through Themyscira. However, she is rejected and thrown into the ocean before Hippolyta rescues her.^[28]

• Jumpa appears in the Teen Titans Go! episode "Justice League's Next Top Talent Idol Star: Justice League Edition".
• Jumpa appears in DC Super Hero Girls.

The Judge is an alias used by different fictional characters appearing in American comic books published by DC Comics. Each iteration is usually depicted as a cloaked figure sporting a courtroom robe and a blindfold or sunglasses as well as wielding a mallet-sized gavel while opposing superheroes, such as Batman and the Flash.

The first version was created by Archie Goodwin and Howard Chaykin, and first appeared in Detective Comics #441 (July 1974). He was a judge in Gotham City who has a scar on his right hand, and father of Melissa Clay who was accidentally blinded due to his corrupt dealings. The Judge blamed Batman for his problems, kidnapping the original Robin as bait for various trap-based weapons in an abandoned summer resort. The Judge was defeated by the Dynamic Duo and turned himself in after accidentally killing his daughter.^[29]

The second version, Jacob de Witt, was created by Sam Humphries and Bernard Chang, and first appeared in Nightwing (vol. 4) #35 (February 2018). He was originally a judge from the 17th century who was tied up and drowned, becoming a blind immortal with the ability to see corruption in people's hearts. In the present, the Judge is a serial killer with a beard and white suit who uses a casino chip calling card in Blüdhaven while having several confrontations with Dick Grayson before being defeated by him and imprisoned.^[30]

In 25th-century Central City, Hunter Zolomon is also known as the Judge.^[31][32][33]

An original incarnation of the Judge appears in The New Batman Adventures episode "Judgment Day", voiced by Malachi Throne.^[34] This version is a violent court-themed vigilante and alternate personality of Harvey Dent / Two-Face.