BEWARE OF SPOILERS!
Dr. Eliza Danvers
Portrayed By: Helen Slater
Karas foster mother and a brilliant geneticist.
- see Superman Film Series for the Earth-96 character who bares her physical likenesssee Smallville: Kryptonians for the Earth-167 character who bares her physical likeness
- Adaptation Name Change: In the Silver Age comics, Supergirl's adoptive mother was named Edna Danvers and was named Sylvia in the Peter David Supergirl comics, instead of Eliza.
- Almighty Mom: Was fair but firm with her daughters during their teenage years, and even today, is a constant source of wisdom and support for the two.
- And Starring: Is credited with a "Special Guest Star" citation.
- Big Damn Hero: She comes to the rescue in "Medusa", curing Mon-El and J'onn of their respective maladies in less than 24 hours of receiving a vector from which to work from.
- Hot Scientist: She's a scientist and is definitely not bad-looking.
- Mama Bear: When the real Hank Henshaw attempts to claim Kara for the DEO, she is his most adamant opposition.
- Motherly Scientist: Literally for Kara, as she helped both her and her cousin adjust to Earth while also studying them.
- Parental Favoritism: Eliza gets accused of this, due to always treating Kara with kid gloves while pushing Alex to protect her. She had a very good reason for this.
- Silver Vixen: Even at her age note , Dr. Danvers would still turn quite a few heads.
- Team Mom: When ever she's involved with the DEO, she takes this role. Often does so outside this capacity for Kara and Alex's friends as well.
- Widow Woman: So it seemed.
Portrayed By: David Hoflin, Zayne Emory (teenager)
A former classmate of Kara and Alex.
- Abusive Parents: His mother beat him, so he became extremely attached to his father when he got her out of his life.
- Adaptation Name Change: Goes by Rick instead of Dick.
- Adaptational Villainy: His comic book counterpart was a Love Interest to Supergirl in her civilian identity. This guy kidnapped Alex to blackmail Kara. He's called a terrorist multiple times.
- Chekhov's Gunman: Appeared in a Season One flashback before showing up as a Villain of the Week in Season Two's present day.
- Disappeared Dad: Until he got him back from his mom. For which he is grateful, to the point of trying to break him from jail through very amoral means.
- Early-Bird Cameo: Introduced through a flashback in Season One before formally appearing as a villain in Season Two.
- Even Evil Has Loved Ones: He loves his father.
- Evil Former Friend: His introduction through a flashback in Season One shows him being cozy with the Danvers sisters. Kara even regretfully mentions all the decent things he has done for her and Alex before officially branding him as an enemy.
- Evil Genius: He's no dummy and did his research before enacting his plan. He even knew about J'onn and saw through him posing as his dad almost instantly.
- Ironic Name: Meta example. He's originally named Dick in the comics. With his Adaptational Villainy, it would have been more appropriate.
- Knight of Cerebus: He is one of the very few villains in Supergirl to not play into the campiness of the old Superman comics, which makes the scenes with him so much more terrifying, particularly that he's accounted for everything the heroes have thrown at him despite having no powers himself.
- Manipulative Bastard: He manages to convince Maggie to break his father out of jail when Kara won't.
- Stalker Without a Crush: He watched Alex and Maggie from afar for a very long time until he was ready to kidnap Alex.
- Stealth Pun: A comics character named Dick renamed Rick who was given Adaptational Villainy. In short, he's essentially still a dick.
- Used to Be a Sweet Kid: Kara regretfully recounts how much of a decent person he was during junior high.
Known Aliases: Superman, Clark Kent, The Man of Steel, The Big Blue Boy Scout, The Man of Tomorrow
Portrayed By: Tyler Hoechlin (Season 2 onwards) / Kevin Caliber (Pilot only) / Daniel DiMaggio (teenager) /
Voiced By: Gabriel Ortiz (Latin-American Spanish dub), Masashi Tamaki (Japanese dub)
Appearances: Supergirl | Elseworlds note | Crisis on Infinite Earths
Kara's cousin... and if you don't know who he is...
- see Arrowverse: Other Earths for infos about his Earth-75 counterpart.see Titansverse: Other Superheroes for infos about the Earth-9 character who bares his name and backgroundsee Superman Film Series for the Earth-96 character who bares his name and backgroundsee Smallville: Kents for the Earth-167 character who bares his name and background
- The Ace: Par for the course with Superman.
- Action Dad: The ending of Elseworlds (2018) reveals that he and Lois are expecting. Subverted when Clark states that his impending fatherhood is the reason he's retiring from superheroics.
- Adaptational Curves: A downplayed inversion. He's still a Tall, Dark, and Handsome man like every version of Superman, but he lacks the straight up Heroic Build that the character is a poster boy for, made more obvious in scenes with James Olsen, who plays the trope straight and is both slightly taller and more muscular than he.
- Adaptational Dye Job: Has green eyes, rather than the blue eyes he has in other incarnations.
- Adorkable: Kara notes Clark has "The Klutz" thing down pat. Clark quips it's not an act.
- Aerith and Bob: Spelling aside, his Krptonian first name doesn't sound out of place on Earth.
- Always Someone Better: Kara is quite self-conscious about being in the shadow of her famous cousin, even though she was originally intended to be his mentor. Subverted as of the Season 2 finale however, as Kara takes him down while mind-controlled and she challenges Rhea for Earth instead of him.
- And Starring: Is credited with "Special Guest Star" citation.
- Arch-Enemy: Despite not being a major player in The Verse, he has two of them:
- Badass Baritone: He has a nicely resonant voice, as is tradition.
- Badass Cape: Part of his Iconic Outfit. He is the Trope Namer and Trope Codifier of The Cape for a reason.
- Bash Brothers: Becomes this with J'onn after they resolve their issues.
- Big Brother Instinct: Again cousin, though Kara often assures him its okay and she can handle many crisis, Clark will always offer his assistance and, if need be, will drop everything to come to her rescue.
- Big Brother Mentor: To Kara. Well, big cousin mentor. Ironically, Kara was his Cool Big Sis back on Krypton, but her being stuck in the Phantom Zone en route to Earth meant he had a head start and is now older than her.
- Big Little Brother: To his older cousin Kara. Even if you don't factor her being stuck in the Phantom Zone, he'll most probably outgrow her anyway.
- Brainwashed and Crazy: He was mind-controlled by Myriad at the end of Season 1, and put under Rhea's thrall at the end of "Resist".
- But Now I Must Go: Upon retiring to start a family with Lois, he entrusts Kara as the sole protector of the Earth.
- The Cape: He's the Trope Namer and Trope Codifier! Several characters mention his heroic deeds, though we don't get to see them.
- Chest Insignia: It's the El family crest, and it translates to "stronger together."
- Chick Magnet: In his very first full appearance, he gets attention from no less than three women (in order; Alex, Cat and Lena), all without any effort on his part, has a Woman Scorned in Maxima, and is in an established relationship with Lois. (Also noteworthy: Alex later comes out as a lesbian. She still thinks he smells terrific.)
- Clark Kenting: Again, the Trope Namer and Trope Codifier. While it wasn't shown here until Season 2, James accidentally slipping his Secret Identity to Winn allowed the latter to take a second look for confirmation.
- Demoted to Extra: Justified. Since this is a show about his cousin, he is treated as a Hero of Another Story who is the Guest-Star Party Member everytime he appears.
- The Dreaded: In the first season at least one Fort Rozz escapee wants nothing to do with Supergirl because some of them have learned that bad things happen when they antagonize someone with that symbol on their chest.
- Experienced Protagonist: He's already a seasoned superhero when Kara arrived on Earth.
- Even the Guys Want Him: Winn thoroughly compliments his physical appearance, and Alex, who comes out as a lesbian later that season, comments that he "smells terrific."
- Extreme Doormat: Not quite a doormat, but Clark is still too good-natured to turn down doing someone a favor. When Sherloque bamboozles him into delivering an alimony cheque for his ex living on Earth-38, he actually does get to it. The encounter was apparently extremely awkward as she was really rather pissed off that he turned Superman into a delivery boy.
- Face Death with Dignity: He's one of the six last survivors of the entire Multiverse, and spends his final moments telling off the Anti-Monitor that the Paragons will stop him, even given a worried Iris a nod of comfort before being erased.
- The Faceless: In his brief appearances in the first and third episodes, the lighting shadows his face and he is seen mostly from behind. In "Myriad", he is shown from a distance, obscuring his features, and later, in the season finale, lying down recuperating and showing just his boots. It's finally averted when he appears in the second season premiere. He now appears in the Season 2 opening credits as well.
- Famed In-Story: Although clearly stated right from the pilot, it really shows up in the Season 2 premiere when he stops being The Faceless and visits the DEO office. Most of the staff are awestruck at his presence, and these are people who not only work with one superhero, they have another one as their boss.
- Family Theme Naming: With his cousin Kara aka Supergirl.
- Farm Boy: He grew up in a farm on Smallville, which is where Barry Allen and Oliver Queen from Earth-1 found him while they were looking for Kara.
- Flying Brick: He's Superman. He's super strong and super durable and he can fly owing to his Kryptonian physiology.
- The Ghost: In the first season. As an adult, he's only seen in profile when on camera, and has only "spoken" to Kara via a chat window. References to him are usually through eponyms, rather than by name. His only significant appearance otherwise was in a dream that Kara had in "For The Girl Who Has Everything" where he was still a child (played by Daniel DiMaggio). This changes with the move to The CW with a new adult actor being cast.
- Good Is Not Soft: While he always prefers to be as gentle as possible, he doesn't hold back against either of the Metallos, who've proved to be utterly ruthless. According to later eps, he also killed Zod when they fought, before the series started.
- Good Is Old-Fashioned: Has hints of this, what with the fact that he won't drink and fly (even though he can't get drunk) and proposes to Lois on bended knee.
- Guest-Star Party Member: Essentially his role everytime he shows up.
- Hero of Another Story: He's already an experienced superhero by the start of the story.
- He Who Must Not Be Heard: In the first season, even if he does show up (as an adult), he never speaks a single line.
- He Who Must Not Be Seen: When Kara communicates with him in the first season, it's through online chat, and when he does show up on-screen (as an adult), he's The Faceless, or Kara is in the midst of blacking out.
- Hollywood Nerd: Still demonstrates the classic Clark Kent awkwardness, but just about every woman he meets is firmly in agreement how incredibly handsome he is.
- Iconic Outfit: If it's not obvious enough, his superhero costume.
- In Spite of a Nail: During Crisis on Earth-X Eobard Thawne mentions that he faced a version of Clark in the future. According to him Clark was fast...but Eobard's faster.
- Interspecies Romance: He is currently in a relationship with Lois, though at the start of Season Two, Kara mentions that he is a "boyfriend", so they are not yet married. However, he proposes at the end of "Elseworlds."
- I Work Alone: Kara spends some time trying to copy this aspect of his hero work before deciding to embrace the more team-based approach her Kryptonian upbringing instilled in her.
- Lantern Jaw of Justice: Tyler Hoechlin's Superman isn't lacking in that department.
- Leaning on the Fourth Wall: A robber tries punching Supes after the latter proves he's Immune to Bullets. Superman mocks the crook's Genre Blindness by wondering why he'd think his fist would be effective after bullets proved useless.
- Mr. Fanservice: Cat, Alex, and Winn seem to think so.
- Nerds Are Sexy: He's just as adorkable as Kara. Doesn't stop Cat from blatantly Eating the Eye Candy whenever he's around as Clark.
- Never Gets Drunk: But he still won't drink and fly, which Kara considers proof of what a nerd he is.
- Nice Guy: As is tradition for the character, when we finally meet him, he proves very friendly and noble, with a wry sense of humor to boot, and is nothing less than sweet and encouraging towards Kara. He even turns his head when a bank robber tries punching him, just to soften the damage to the dude's hand.
- When Cisco refers to Kara as his "favourite Kryptonian" right to Clark's face, Superman just grins.
- Not So Above It All: Applauds both Kara and Mon-El's Heroic Sacrifice, putting the good of the world before each other, and admits to Kara if it had been him and Lois, he may not have been able to make the same choice.
- Offscreen Moment of Awesome: Most of his superhero adventures are off-screen.
- Older Than They Look: Superman Hand Waves the fact that he doesn't look 12 years older than Kara because Kryptonians age slower on Earth (likely due to the yellow sun).
- Passing the Torch: Upon retiring, he entrusts Kara as the sole protector of the Earth, Metropolis included.
- Perma-Stubble: He has a very short beard.
- Primary-Color Champion: As ever. Unlike Kara, he has a more "classic" S-shield.
- Red Baron: "The Man of Steel", "The Big Blue Boy Scout" and "The Man of Tomorrow" are the only ones confirmed in this version, though canonically he has tons.
- Related in the Adaptation: The show's version of Non becomes part of his extended family due to him being married to Kara's maternal aunt.
- Retired Badass: Retires from superheroics after the ending of Elseworlds (2018) due to his impending fatherhood.
- Secret Keeper: For a while he was the only person on Earth who knew "Hank Henshaw" is actually J'onn J'onzz.
- Sink-or-Swim Mentor: He hoped that Kara would become a hero like him and sent James to keep an eye on her, though with instructions to let her make the decision herself.
- Superheroes Wear Capes: He is the Trope Namer and Trope Codifier of The Cape for a reason.
- Superman Stays Out of Gotham:
- He intervenes to save Kara from Reactron after James calls for assistance. After that, he promises never to intervene in National City's affairs so that she can become her own hero. He later gets concerned again after Astra's army escalate their war, to which Kara assures him she'll ask for his help if she really thinks she needs it.
- In Season Two, he and Kara team up for the entire premiere episode, but he also decides to stick around at the end of it, only returning home once Metallo is defeated.
- The reason why he doesn't help more often with DEO cases is that he had a falling out with J'onn over his decision to stockpile Kryptonite, although they reconciled.
- Reaches almost ridiculous levels in Season 3 where, despite the worldkillers being, well, potentially world-killers, his cousin being rendered comatose after being defeated by Reign, his former Legion teammates coming back from the future, and a piece of Krypton being discovered intact with his own aunt still alive upon it, Superman is nowhere to be found and no one appears to even think of asking him for help (or come to Argo City and see his family).
- However, for the Season 3 finale, there is at least the explanation of him doing damage control in Madagascar.
- Tall, Dark, and Handsome: He stands six feet tall and is ogled by multiple characters.
- The Teetotaler: He refuses to drink alcohol of any sort, regardless of the fact that his powers prevent him from getting drunk anyway.
- Two First Names: Per the DC Comics norm (his Earth identity, to be specific).
- Unseen No More: He was constantly teased in Season 1 as the show's favorite Easter Egg, being constantly mentioned and rarely directly. Even the few times he did appear he would be The Faceless. This finally changes as of Season 2 following the network change for the show, where he shows up proper and assists Kara as a Guest-Star Party Member when he does.
- The Voiceless: He had no speaking lines as an adult in Season 1, once communicating with Kara through online chat. Not anymore in Season 2.
- Vitriolic Best Buds: James says that he and an infamous unnamed vigilante are friends despite their different approach in heroics, while Winn quickly points out that the two are more "Frenemies".
- Clark also had hints of this with J'onn; while they respected each other, they fell out over J'onn stockpiling Kryptonite. However, they make up for it in season 2 when Clark accepts that J'onn really has his and Kara's best interests at heart, and J'onn offers all of the Kryptonite to him in a gesture of trust.
- We Used to Be Friends: Both James and Lillian have mentioned in different occasions that Clark and Lex Luthor were once the best of friends.
- The Worf Effect: He loses to Supergirl in the second season finale when believing she was Zod while under the influence of silver kryptonite, despite his admitting he was at full strength, in order to justify Kara being the one to face Rhea in combat for the earth. Possibly Fridge Logic given he's clearly overcome by rage and reduced to Unskilled, but Strong while Kara uses skill to even the playing field. Indeed a few scenes later when sparring he's having to teach her moves he learned on Warworld which he didn't bother using in their earlier fight.
Portrayed By: Elizabeth Tulloch
Appearances: Elseworlds note | Crisis on Infinite Earths
A renowned reporter from the Daily Planet. She is Sam Lane's eldest daughter and Lucy Lane's older sister. Also Clark Kent's significant other. And Cat Grant's professional rival.
- see Arrowverse: Other Earths for infos about her Earth-75 counterpart.see Superman Film Series for the Earth-96 character who bares her name and backgroundsee Smallville: Lanes for the Earth-167 character who bares her name and background
- Action Girl: She's not afraid to get into action. Then again, she is a Military Brat.
- Action Mom: She's not afraid to get physical even while pregnant with Clark's child.
- Alliterative Family: With her sister Lucy.
- Alliterative Name: Perhaps the most prominent person with the L.L initials in the entire Superman mythos.
- Aloof Dark-Haired Girl: Zig-Zagged. She's very snarky towards Oliver, but not to anyone else.
- Cool Big Sister: While it's unknown her relationship with Lucy is, she does seem to have this with Kara, given that Clark functions as a Cool Big Bro, and Kara is incredibly fond of her. She also seems to trust Kara completely, given that Lois almost immediately drops her initial suspicion and begins to trust Barry and Oliver after learning they are friends of Kara.
- Drop the Hammer: Her Weapon of Choice during Elseworlds, first attempting to use one on Oliver and Barry then bringing a huge one when aiding Kara and the latter two on Earth-1.
- Eating the Eye Candy: She may love Clark, but after coming across the other versions of Superman across the Multiverse, she and Iris can't help but admire the many other Hunks that don the cape.
- Gag Nose: Cat makes fun of her nose in one episode, though this is more of Informed Flaw.
- The Ghost: Spends the first four seasons of Supergirl (2015) as a throwaway character until finally making an appearance in the fifth annual Arrowverse Crossover, Elseworlds (2018).
- Intrepid Reporter: Her going "all out" to find her own story was mentioned by a number of characters.
- Interspecies Romance: She is in a relationship with Clark, though as of the start of Season 2 they are still just boyfriend and girlfriend. Clark finally proposes to her in Elseworlds.
- Military Brat: She's the eldest daughter of General Lane.
- Pregnant Badass: Is not afraid to get into action even while she's pregnant.
- Raven Hair, Ivory Skin: She has dark brown hair and a notably pale complexion.
- The Rival: She was Cat's biggest competition while she was at the Daily Planet, though Cat claims they have a Friendly Rivalry.
- Scarf Of Asskicking: She's wearing one during Elseworlds.
- Secret Keeper: She knows Clark is Superman. Ditto Kara being Supergirl.
- Two First Names: Per the DC Comics norm.
- Vitriolic Best Buds: Cat mentions that they are good friends shortly after saying unpleasant things about her.
- Wrench Wench: We first meet her as she's working on the Kents' truck.
The Editor-in-Chief of the Daily Planet and Cat's previous employer. Like Lois, the character has yet to actually appear on screen in Supergirl, or any other Arrowverse series, but has been referenced numerous times.
- see Superman Film Series for the Earth-96 character who bares his name and backgroundsee Smallville: Daily Planet for the Earth-167 character who bares his name and background
- Catchphrase: "Great Caesar's Ghost!", apparently:Clark: (on the phone with Perry) ...you still say "Great Caesar's Ghost", which is a bit of a throwback.
- Da Editor: He's the big boss of the Daily Planet.
- Deadpan Snarker: Hints at this. When Clark says he'll have a story in a "jiffy", Perry apparently asked what sort of unit of time a "jiffy" was.
- Friendly Rivalry: The Daily Planet and CatCo have a respectable competition with each other and will not tolerate snitches on their respective ranks.
- The Ghost: He's never seen on-screen, just referred to.
- Hair-Trigger Temper: Cat mentions that he's easily agitated.
- Hypocritical Humor: He makes fun of Clark for using the old-fashioned phrase "lickety-split" despite the fact that he's fond of using "Great Caesar's Ghost!" all the time.
- Mean Boss: Cat doesn't have fond memories of him.
- Stern Teacher: Despite acknowledging that he's a Mean Boss, Cat still displays a huge amount of respect for him.
- Trash the Set: Literally. Cat mentioned that he once threw a chair out of a window out of frustration.
An old friend of Clark's, and Lois and Lucy's cousin, that is fascinated in the weird and bizarre.
- see Smallville High for the Earth-167 character who bares her name and background
- Canon Foreigner: Somewhat, While she was bought and now owned, and has made cameo appearances in DC Comics, she has yet to appear altogether in the New 52, and is mostly relegated to the Smallville continuity, of which she had been specifically created for.
- The Ghost: Does not appear in person, but Kara has been in correspondence with her.
- Hollywood Hacking: Helps Kara and Alex in their research while investigating the death of their friend Kenny, by accessing files and photos, embedded in Kenny's telescope.
- Intrepid Reporter: Was one in high school, and most likely one at the Daily Planet with Clark and Lois.
- Mythology Gag: She and her "Wall of Weird," were a staple for the Smallville, plot structure.
- Secret Keeper: Is one for Clark, and appears to be one for Kara as well.
- Weirdness Magnet: Openly seeks out bizzare and weird events, and most likely, attracts them because of this.
Reactron / Ben Krull
Known Aliases: Reactron
Portrayed By: Chris Browning
The first of Superman's foes to clash with Kara.
- Badass Normal: He nearly kills a then-inexperienced Supergirl despite only being clad with Powered Armor. According to James, he gave Superman a similar beating.James: I've seen what Reactron can do. [...] He nearly killed Clark once.
- Clothes Make the Superman: He doesnt have any superpowers of his own; they're all derived from the high tech suit he wears.
- Even Evil Has Loved Ones: The very reason he became a villain is trying to avenge the death of his wife.
- Powered Armor: He wears a high tech suit of armor that gives him his abilities.
- Revenge by Proxy: He comes after Supergirl when he finds out shes Supermans cousin. He wants to kill her to hurt him.
- Revenge Myopia: Reactron blames Superman for the death of his wife, who died when Superman stopped a reactor meltdown in the facility where they both worked.
- Rogues-Gallery Transplant: Played with. Reactron in the comics is a Supergirl enemy. Here he's changed to an enemy of Superman, but he still fights Kara.
Species: Human-Kryptonian Hybrid
Portrayed By: Emma Tremblay
Samantha's daughter, with whom she was pregnant already as a teenager. She is a huge fan of Supergirl.
- Adult Fear: Is repeatedly put into dangerous situations, much to the horror of her mother.
- Ambiguously Human: Lena's research shows that the Worldkillers' DNA rewrites itself when their Worldkiller selves are dominant and is human when their human personas are in control. Thus, there's no reason to think Ruby, who is Sam's daughter, not Reign's, is anything but human. However, Sam is bred from Kryptonian DNA, so it could be possible whatever power Ruby has, if she has any at all, is suppressed by the human DNA.
- Children Are Innocent: Is consistently portrayed as a very sweet and good-natured, if a bit naive kid.
- Deliberately Distressed Damsel: After figuring out that her mother has powers, she walks into the middle of chaos caused by Psi to make them appear again.
- Disappeared Dad: There is no information given about her father whatsoever.
- Fangirl: She is a huge fan of Supergirl and superheroes in general.
- Put on a Bus: Leaves for Metropolis after Supergirl Season 3.
- Spanner in the Works: According to Selena, Sam having Ruby delayed her turning into Reign by several years. Which in turn delayed the emergence of the other Worldkillers, since that was triggered by Reign's.
- When You Coming Home, Dad?: Is often a little frustrated about how much time she has to spent alone due to her mother's job.
Known Aliases: Batman, The Dark Knight, The Caped Crusader, The World's Greatest Detective
- see Arrowverse: Gotham City page to see his Earth-1 counterpartsee Arrowverse: Earth-2 page to see his Earth-2 counterpartsee Batman 1966 Heroes page to see his Earth-66 counterpartsee Batman Film Series: Bat-Family page to see his Earth-89 counterpartsee Arrowverse: Other Earths page to see his Earth-99 counterpart.
- Anti-Hero: A Vigilante Man with lots of issues.
- Badass Cape: It has a jagged on the tips design and it helps him glide on tall structures.
- Badass Normal: The Trope Codifier in comicbooks. A simple Vigilante Man whose main arsenal are his gadgets, physical skill and keen intellect.
- Broken Ace: A Badass Vigilante Man, who according to Kara, has tons of issues.
- Cool Car: It's fast, tough, and is equipped with tools made from top quality technology.
- The Cowl: The Trope Codifier. He's a hero alright, but one who inspires fear rather than hope. James even compares himself to him when discussing his frustrations on being a Hero with Bad Publicity.
- Crimefighting with Cash: He is filthy rich, which certainly helps in his crusade.
- Dark Is Not Evil: His overall look, name and Red Barons are all heavily themed with darkness. That doesn't make him a bad guy.
- Famed In-Story: Being a contemporary of Superman, he is just as well known (but not as revered). This contrasts him with his Earth-1 counterpart, who is instead Shrouded in Myth.
- The Ghost: He never appears on-screen, just referred to due to issues with the DC Extended Universe.
- Hero of Another Story: He's already an experienced superhero operating in his own city.
- Hero with Bad Publicity: Despite fighting for justice and what's right, he does it his way. As a result, he doesn't get the adoration and respect his contemporary/frenemy Superman gets. For context, James is at one point afraid that he'll end up just like him when contemplating his own vigilante career. This also contrasts him with his Earth-1 counterpart, who is instead Shrouded in Myth.
- Iconic Outfit: Even Winn has heard about his pointy-eared cowl.
- In Spite of a Nail: He is confirmed to exist on both Earth-1 and Earth-2, both as Batman.
- No Name Given: To avoid lawsuits. While Word of God confirmed it years before, it wasn't until Elseworlds (2018) where his name is finally explicitly mentioned (by Kara).
- Offscreen Moment of Awesome: His badassery and heroics are never shown on-screen.
- Superheroes Wear Capes: A contemporary superhero of Superman and is equally as Badass as him.
- Two First Names: His last name could easily pass as his second given name.
- Vigilante Man: Referred to as such by Kara, while trying to reason with James that being one is dangerous.
- Vitriolic Best Buds: James says that he and Clark are friends despite their different approach in heroics, while Winn quickly points out that the two are more "Frenemies".
- Where Does He Get All Those Wonderful Toys?: He is renowned for possessing tons of gadgetry.
- Writing Around Trademarks: The main reason why both his real and superhero names took years to be mentioned on-screen, part of the embargo with the DC Extended Universe. Until 2017, the only part of his mythos that was explicitly mentioned in the show is his home city, Gotham.
Portrayed By: Laurie Metcalf
Winn Schott's mother and Winslow Schott's former wife.
- Daddy Had a Good Reason for Abandoning You: She left Winn as a boy because Winslow threatened to hurt him if she stayed. Even after Toyman's death, he had arrangements to posthumously prevent Mary from approaching Winn.
- Gadgeteer Genius: She's not a tech genius like her ex and son, but her knowledge of mechanical devices is sound.
- Long-Lost Relative: Mary is Winn's mother, who was not seen hitherto.
- Mama Bear: She is very protective of Winn. She grabs a robotic flying monkey by the leg when it tries to attack him.
Portrayed By: Blake Jenner
Voiced By: Gabriel Ortiz (Latin-American Spanish dub)
Cat Grant's oldest son who was raised by his father.
- Adaptation Name Change: In the comics, Cat's son is named Adam Morgan. Here, he retains the first name but his last name has been changed to Foster.
- Age Lift: Due to him and his half-brother Carter being a Decomposite Character of Cat's son in the comics. He got the (first) name but he's aged up to be 25 years old, while his half-brother gets the canonical age.
- Casting Gag: Played by Melissa Benoist's former Glee co-star and then-husband.
- Decomposite Character: With his half-brother Carter Grant, for Cats son in the comics, Adam Morgan. He gets the name while Carter gets the age.
- Long Bus Trip: Very unlikely to appear again due to Cat being demoted to a Recurring Character. His actor's divorce from Melissa Benoist also does not help.
- Long-Lost Relative: For Cat and her side of the family.
- Missing Mom: Cat was away most of his life. He resents her for that.
- Morality Pet: For Cat, even more so than her younger son Carter, because she views her When You Coming Home, Mom? situation with Adam as My Greatest Failure.
- Odd Name Out: Notice how his name doesn't have the phonetic "K" sound like the rest of his maternal relatives? Justified that his father probably named him.
- Sibling Triangle: He likes Kara, while Carter has a crush on Supergirl.
- Third-Option Love Interest: For Kara, with Winn and James being the main Betty and Veronica.
Portrayed By: Garwind Sanford
The husband of the late Isabel Nal and the father of Maeve and Nia.
Portrayed By: Kate Burton
A Naltorian native who was the wife of Paul Nal and the mother of Maeve and Nia.
Species: Human-Naltorian Hybrid
Portrayed By: Hannah James
The oldest daughter of Paul and the late Isabel Nal, and the estranged older sister of Nia.
- Green-Eyed Monster: She's visibly upset when Nia inherited their mother's powers.
- Half-Human Hybrid: She and Nia are the offspring of a human father and a Naltorian mother, as shown in "Blood Memory".
- I Just Want to Be Special: She desperately wanted to inherit her mother's powers since she was young.
- Sore Loser: All she ever wanted was to inherit her mother's powers. When it instead manifested on Nia, Maeve goes full-on Smug Snake.
Portrayed By: Carlos Bernard
Maggie Sawyer's estranged, conservative father.
- Bait the Dog: When Maggie first meets him again, he seems a changed man, being incredibly friendly towards both her and Alex. However, after witnessing a kiss between them on their maiden shower, he storms out in disgust.
- Calling the Old Man Out: On the receiving end. Maggie makes it clear to her father that she's no longer the scared little girl that seeks his approval.Maggie: That little girl, so desperate to win her father's love... you left her on the side of the road. And after all these years, I've been that little girl. Yearning for my papa to come back for me, praying that one day he would see me and love me for who I am. Thank you for coming to the shower, you gave me an amazing gift. You showed me that I'm not that scared little girl in that picture anymore. I'm an adult woman, and I'm happy in my own skin, and I'm so fortunate that I'm surrounded by people who value and cherish me. I finally understand that I don't need you to see me or to get me or to even like me, I don't need anything from you! I'm already good. Good bye, papa.
- Celebrity Paradox: 24 was mentioned by Winn during a Season 2 episode. His actor was a main cast member of the show.
- I Have No Daughter!: Years ago, after finding out that Maggie is a lesbian, he (and his wife) disowned her and left her at her aunts house.
- Self-Made Man: He worked so hard to win everybodys respect that the same boys who used to ridicule and beat him up as a kid later elected him the sherrif of their town.
- Troubled Sympathetic Bigot: While it doesn't excuse his actions, his backstory is rather tragic. He came to America when he was 9, worked in a factory at 11 where all the other (white) boys would beat him because he was Mexican, and worked hard enough that those same boys elected him sheriff as an adult. He tells Maggie he worked that hard so that his children would never have to face that sort of prejudice, and he sees Maggie's homosexuality as something that could hurt her in the long run; he doesn't want her to not get married, he just doesn't want to see it.
Played By: Betty Buckley
The adoptive mother of Samantha Arias.
- Farm Girl: She owns a farm outside National City.
- Killed Off for Real: Reign kills her when she tries to reach out for Sam.
- Parental Substitute: She raised Samantha as her own.
- Parents as People: She was often cold towards Samantha and even disowned her when she became a teen mother. But ultimately, she did love Sam and wanted her to lead a normal life.
The third ex-wife of Harrison Sherloque Wells.
Kelly Olsen, USAMC
Played By: Azie Tesfai
James Olsen's younger sister.
- Black and Nerdy: African-American and a psychologist.
- Canon Foreigner: In the comics, Jimmy is an only child.
- Foolish Sibling, Responsible Sibling: The responsible to James' foolish. She often finds his behaviour too impulsive and dangerous and she has been taking care of him over the fifteen times he was in the hospital during their lives.
- Generation Xerox: Joins the U.S. Army like her father.
- Military Brat: Her late dad was in the Army Reserve.
- Minored In Ass Kicking: She was a warrant officer in the army but has since left the active life of the military.
- Nice Girl: She and James are obviously close and she is very supportive.
- Relationship Upgrade: She and Alex begin a relationship at the end of the Season 4 finale.
- The Shrink: She works as a psychologist, specialized in PTSD. She encourages her brother to seek treatment after being shot by Eve.
- Straight Gay: It is revealed in Will the Real Miss Tessmacher Please Stand Up? that Kelly is a lesbian.
- Subordinate Excuse: Back when she was still a specialist, she became engaged to her sergeant. Unfortunately, the sergeant was killed in action and Kelly was stricken with grief.
Outside North America
Red Daughter / "Linda Lee"
Species: Kryptonian Clone
Known Aliases: Snowbird, Red Daughter, Linda Lee, "Supergirl"
Portrayed By: Melissa Benoist
A clone of Kara Danvers who came to exist when the original Kara went back in time and utilized the Harun-El in order to defeat Reign. She landed in Kaznia and wound up working with its soldiers on an unknown agenda.
- Alliterative Name: As Linda Lee.
- Ambiguously Evil: So far, she hasn't done anything villainous per se, but it is clear that the Kaznians controlling her are up to no good. It's later shown that she is basically just as heroic as Kara, but unfortunately Lex manages to manipulate her into becoming his lackey.
- Amnesiacs are Innocent: All Red Daughter remembers is the name "Alex" and a desire to help others. Lex takes advantage of both to get her on his side.
- Chronic Hero Syndrome: She has this initially, but since she can't control her powers the results are ... messy.
- Does Not Know His Own Strength: Initially, given that she's a clone created not too long ago.
- The Dragon: Becomes Lex's enforcer after the latter managed to manipulate her long enough.
- Evil Knockoff: Played With. She is a clone of Kara created to do Lex's bidding, but she herself is not an evil.
- Fusion Dance: She merges with Kara after Lex fatally injures her.
- Gender Flip: She is based off the Red Son, who is a copy of Superman rather than of Supergirl.
- Genius Bruiser: In addition to her vast physical power, she is incredibly smart, reading through the books sent to her very quickly and later recalling passages to near-perfection. She also shows an emotional intelligence and insight that nearly derails Lex Luthor's manipulations, recognizing Kara's compassion and Lex's motives of envy and ambition.
- Hidden Villain: Outside of the Kaznia military, no one knows there exists a clone of Supergirl that is being used by the military to be their weapon.
- Mythology Gag: While Kara Danvers underwent an Adaptation Name Change, her comic name Linda Lee instead went to Red Daughter.
- No-Holds-Barred Beatdown: Delivers a vicious one to Kara, her additional powers certainly helping.
- No Name Given: Initially, there wasn't an official name for the clone, but press releases have called her character Red Daughter, a Shout-Out to the Superman story of Superman: Red Son. Lex later calls her that himself. Red Daughter also uses the alias "Linda Lee", as a homage to the Silver Age.
- Obliviously Evil: She is genuinely good, sweet, and compassionate, but she's manipulated to serve the agenda of Lex Luthor.
- Redemption Equals Death: After discovering Luthor's treachery and initially being subdued by him, she later escapes and saves Kara from him, taking a full Kryptonite blast that fatally injures her. Before she succumbs to her wounds, she merged into Kara.
- Rousseau Was Right: Despite having been created from the Harun-El, she is not villainous like Reign and has the same drive to protect the innocent as Kara; she's simply being led down the wrong path by Lex.
- Sensory Overload: Happens when she's exposed to yellow sunlight, resulting in Power Incontinence.
- Super-Speed Reading: She reads all of the books Lex Luthor gives to her in this fashion.
- Unwitting Pawn: To Lex.
- You Have Outlived Your Usefulness: Lex apparently kills her during his scheme to portray himself as America's saviour. While she survives this, he then has her put in a power draining device, fully intending to kill her.
Portrayed By: Gabriel Gurevich
A young Kaznian boy whom Red Daughter saves from a bunch of violent thieves after discovering her powers.
- Abusive Parents: Describes his father as a "bad man" who left him and his mom.
- Children Are Innocent: Shown to be very sweet and caring.
- Faking the Dead: Lex orders Otis to kill him in order to further manipulate Red Daughter, but he can't bring himself to do it, so he tells Mikhail to fake his death.