Star City: Team Arrow (Oliver Queen / Dinah Laurel Lance) | Family Members | Citizens | Criminal Groups (Malcolm Merlyn / Slade Wilson / Prometheus) | Independent Criminals
Central City: West-Allen Family (Barry Allen / Iris West-Allen) | Team Flash (Caitlin Snow & (Killer) Frost) | Citizens | Criminal Groups (Rogues) | Independent Criminals
National City: Citizens (Kara Zor-El / James Olsen) | Luthor Family & Associates | Criminals
Freeland: Pierce Family | Citizens | Criminals
Gotham City: Bat-Family | Citizens | Criminals
Smallville & Metropolis: Smallville Citizens | Metropolis Citizens | Metropolis Criminals
The Legends: The Team | Current Members (Sara Lance / Mick Rory / John Constantine) | Former Members (Ray Palmer / Leonard Snart)
Organizations: U.S. Government | U.S. Military | A.R.G.U.S. | The D.E.O. | The J.S.A. | The League of Assassins | Criminal Groups (H.I.V.E. / Savage & His Followers)
Time Travel: Time Travelers (The Legion / Eobard Thawne / Damien Darhk / Savitar) | The Past | The Future
Miscellaneous: Other Locales | Metahumans (Firestorm / The Hawks / Grodd) | Aliens | Mystics | Other Entities
The Multiverse (Pre-Crisis): Other Earths | Earth-2 (Hunter Zolomon) | Earth-38 | Earth-90 | Earth-X
- Adaptation Origin Connection:
- The Accelerator explosion that granted them their powers, when most of them have origins completely unrelated to each other (or the Flash). "Power Outage" sees Thawne namedrop other victims of the explosion that are established characters in the comics that, again, are completely unrelated otherwise.
- While later seasons follow with new means of gaining powers, such as the Philosopher's Stone or the Dark Matter Bus Metas, this trope is still in play as all of that was only made possible because of the first generation of metahumans who instigated these later events.
- All There in the Manual: More information about metahumans is divulged in two spinoff media:
- The Chronicles of Cisco, a blog which is basically a budding encyclopedia filled with details about criminal metahumans (and even the ones who don't have super powers, like Cold and the Bug-Eyed Bandit). Several entries also include some misadventures Cisco (and sometimes Caitlin) would have just taking care of them.
- The Flash: Season Zero, a digital tie-in comic which introduces a few new metahumans which have yet to appear on the show.
- Differently Powered Individual: Literally; though the majority of metahumans introduced have been created by the particle accelerator explosion, it is possible to acquire metahuman powers from other sources. This becomes a plot point in season 5 where Cicada's dagger can only detect and nullify the powers of dark matter empowered metahumans.
- Go-Karting with Bowser: The Chronicles of Cisco details Cisco partaking in "Movie Night" with the Pipeline's denizens.
- Informed Ability: According to Cisco and Julian, all metahumans (or at least those affected by the Particle Accelerator explosion) have a Healing Factor. This even becomes a plot point in The Flash Season 3 when Caitlin is gravely injured. In order to save Caitlin's life, her Power Nullifier was removed which directly results to her full transform as Killer Frost. However, only speedsters have demonstrated this ability until that moment.
- Informed Attribute: In Season 2, according to the Earth-2 Wells, there are far more metahumans than what we've seen so or that's been implied thanks to the Flash being a deterrent against the more malicious ones acting out in the open. We've yet to see this come to fruition as the following seasons see Team Flash dealing with metahumans unrelated to the Particle Accelerator Explosion.
- Inhumanable Alien Rights:
- In Season One, the criminal ones didn't get a trial, they were just sent to the Pipeline when Barry caught them; it's somewhat justified since Iron Heights (or any normal prison) isn't exactly equipped to handle them and they are all guilty of numerous crimes — mainly violent ones. At least until the Particle Accelerator goes back online and they all escape during a botched transfer to Lian Yu.
- Averted in Season Two, now that Iron Heights has been modified to contain them.
- In-Series Nickname: Everyone except Clyde Mardon and Griffin Grey got one courtesy of Cisco.
- Karmic Transformation: They get their superpowers related to something that they are in contact with (or close to, anyway) during the Accelerator explosion. Like the Mardon brothers flying their plane during a storm, Black conducting his stem cell research, Nimbus is in a gas chamber, etc. That said, we still have no idea how some of them (Bivolo, Baez, Bates, Simmons) got their respective powers.
- Enforced with the Bus Metas. The 12 individuals were specifically manipulated to being on the same bus at the time of a sudden Dark Matter resurgence into the world. DeVoe's specific plans involved each individual gaining their specific powers, giving him every option he may need to combat Team Flash. A programmer becoming a technopath, a blackjack dealer gaining luck manipulation, a musician gaining sonic abilities, and so on. Devoe also ensures that the one outlier of that mass empowering event, the driver of the bus, is killed to avoid any complicating variables.
- Mass Super-Empowering Event: There have been several events that have given rise to multiple metahumans.
- The first and largest event was the Particle Accelerator Explosion during December 2013. The majority of the Season One metas and a few from later seasons got their powers from this source.
- There was also a similar Particle Accelerator Explosion on Earth-2, which Zoom's metahumans originate from.
- Season Three has metahumans being created through the Philosopher's Stone thanks to the work of Alchemy/Savitar, which was capable of restoring powers to those who had them in the Flashpoint timeline.
- Season Four had DeVoe orchestrating one of these. Manipulating Barry to be released from the Speed Force, opening a portal that released dark matter onto a bus of people.
- Season Five plays with the formula. The shrapnel of the dark matter infused S.T.A.R. Labs satellite DeVoe used as a Colony Drop can not only empower people it hits but also any potential object it hits, creating what's coined as metatech. The latter makes it possible for potentially anyone to use meta powers undetectable to conventional metahuman detectors.
- Monster of the Week: The majority of the evil ones are villains that are faced once or twice in the series. The most notable exceptions are The Reverse-Flash and Firestorm.
- Mutant: The metahumans have all been altered on a genetic level and the Arrowverse makes it a clear distinction that the metahumans are a different category from other people with powers.
- Pragmatic Adaptation: Since metahumans are a relatively new concept in this show, the Pipeline is placed underneath S.T.A.R. Labs instead of in Iron Heights. In Season Two, the prison is properly equipped with a Pipeline, although the first Pipeline is still functional.
- Rogues Gallery Transplant: Quite a few of them aren't/weren't enemies of The Flash in the comics.
- Tailor-Made Prison: The Particle Accelerator, the one root of all their powers, is outfitted to become their prison. To avoid charges of illegal imprisonment, Cisco designed a power-dampening section in Iron Heights.
- Touched by Vorlons: Those empowered by the Thanagarean meteorite, particularly Vandal Savage, as well as both Hawkman and Hawkgirl and their Reincarnations.
- Trapped in Another World: Most of the metahumans from Earth-2 (Zoom was taken to the Speed Force by Time Wraiths, Black Siren and King Shark were incarcerated by A.R.G.U.S., and Dr. Light is currently a Fugitive).
- With Great Power Comes Great Insanity: With a handful of exceptions, most of the meta-humans went Ax-Crazy with their powers, causing chaos and destruction. A good chunk of them were criminals before they got their powers, though. Some of them explicitly have their psychology warped from gaining powers like Killer Frost, or DeVoe's descent into sadism being attributed to excess dark matter.