There have been two different characters using the Firefly moniker in DC Comics. The first, Garfield Lynns, was first introduced in Detective Comics #184 (June 1952) by France Herron and Dick Sprang. Pre-Crisis, he was a down and out film special effects expert, specializing in lighting, who became a criminal and later a costumed one. He fought Batman and Robin, the Creeper and the Outsiders. Post-Crisis, Lynns specialized in pyrotechnics and was a bit of a pyromaniac.
The second Firefly was Ted Carson; he was a wealthy heir who dwindled his fortune down to nothing. He was created by Bill Finger and Sheldon Moldoff in Batman #126 (1959). He masterminded a plot to steal from his family to improve his financial situation. Carson also was a romantic rival of Bruce Wayne’s for the affections of Kathy Kane, the Golden Age Batwoman. In the end Batman, Robin and Batwoman thwart his plans. Post-Crisis there was no Carson Firefly. The New 52 introduced Ted Carson, a former high school teacher. Carson tried to incinerate anything that interfered with his relationship with his ex-girlfriend. He murdered Garfield Lynns, in order to blame Lynns for Carson’s crimes. Carson was defeated by Nightwing and Batgirl. Bridgit Pike, Gotham’s Firefly seems to be very different from either version.
Cornelius Stirk first appeared in Detective Comics #592 (November 1988) by Alan Grant and Norm Breyfogle. Stirk used fear to get to his victims. He had the ability to hypnotically alter who he appears to be in people’s minds. Stirk was a very disturbed cannibal. He believed he needed certain nutrients and hormones from people’s hearts to stay alive. He felt it worked better when norepinephrine was in his victims system. Norepinephrine is a hormone related to the fear response.
Basil Karlo is the name of the first Clayface. Karlo was introduced in Detective Comics #40 (June 1940) by Bob Kane. Karlo was a B-Movie actor who was upset when the studio was going to remake one of his films without him. He masqueraded as the film’s villain Clayface. This character was inspired by Lon Chaney Sr.’s Phantom of the Opera, Boris Karloff and Basil Rathbone. This Clayface was originally a costumed criminal, not a true supervillain. The second Clayface was Matt Hagen; he debuted in Detective Comics #298 (December 1961) by Bill Finger and Sheldon Moldoff. Hagen was a professional treasure hunter who found a pool of radioactive protoplasm. He ended up immersed in it. It turned him into a claylike being that can change shape. Later Karlo injected himself with blood for Hagen and two other clayfaces to gain all of their powers. Karlo was the New 52 Clayface. In this version Karlo was a failed actor who worked for Penguin. He was given a sample of clay said to be the origin of the Navajo legends of the skinwalkers as payment for services rendered. The clay leaped at Karlo and entered his body through osmosis. This transformed him into Clayface.
Black Siren was created for the Justice League Animated Series as a member of the Justice Guild in “Legends, Part I”(April, 2002). The Guild members were analogs to various Golden Age DC Superheroes. Black Siren was based on the Golden Age Black Canary. The chemistry between Dr. Tina McGee and Henry Allen was an in-joke. John Wesley Shipp and Amanda Pays were cast members of the 1990 Flash TV Series. Shipp played Barry Allen and Pays played Dr. Tina McGee his on-again, off-again love interest. The Blackest Night reference relates to the Green Lantern Corps’ oath. Also it refers to the Blackest Night crossover event. In that event a recently revived Barry Allen became a Blue Lantern. Blue Lanterns harness Hope.
Taiana mentioned Kovar. In DC Comics, Leonid Kovar was Red Star, a Soviet era Russian superhero with superhuman strength, speed, invulnerability, endurance, and a fire like energy form. He was a member/ally of the original Teen Titans. He was created in Teen Titans #18 (December, 1968) by Len Wein, Bill Draut, and Marv Wolfman. Originally, he was named Starfire, but his name was changed so he would not be confused with Koriand’r (Starfire) of the New Teen Titans. He was the son of an archeologist who gained his abilities after an encounter with an extraterrestrial ship. Whether the villainous dictator Taiana mentioned is Leonid, his father, or another relative remains to be seen.
Rex Tyler was also known as Hourman. He was created by Ken Fitch and Bernard Baily in Adventure Comics #48 (March 1940). Tyler was a chemist that created Miraclo, a drug, which gave him super strength and super speed for an hour each dose. Originally Hourman was a member of the Justice Society of America on Earth 2. After the Crisis on Infinite Earths, the JSA was part of the main timeline. Two other Hourmen have existed, one was Rex’s son, Rick, and another was an android named Matt Tyler, who was molded after Rex’s DNA from the 853rd Century. The introduction of Rex and some of the casting notes for Season 2 hint a JSA heavy season.