What If the Arrowverse was in the DCEU?

DCTV is a subsidiary of the DCEU that is centered on various interconnected television series based on DC Comics superhero characters, primarily airing on HBO as well as web series on HBO Max and DC Universe.

Earth-1 of my Marvel/DC Multiverse.

Green Lantern Corps
Airing: 2017-23

Seasons: 5

Plot: Gifted yet cocky test pilot Hal Jordan's life changes after he's saved by a near fatal crash by a comet hitting the plane with a green ring inside. When he wears said ring, he quickly learns that he has been offered a spot in the Green Lantern Corps and that they're at the front line of a battle against unseen forces bent on destroying the galaxy. Before long, Jordan is forced to choose between his life of fortune and status or leave it all behind to defend the world as a hero that is only limited by his imagination.

Protagonists: Antagonists:
 * André Holland as John Stewart/Green Lantern
 * Henry Zaga as Kyle Rayner
 * Nathan Fillion as Hal Jordan
 * Kevin Michael Richardson as Kilowog
 * Thomas Middleditch as Tomar Re
 * Stephanie Sigman as Jessica Cruz
 * Sean William Scott as Guy Gardner
 * Luke Evans as Thaal Sinestro (S1)
 * Kevin Grevioux as Atrocitus (S2)
 * Nekron & The Black Hand (S5)

Nightwing
Airing: 2017-25

Seasons: 8

Plot: Nick Grayson has served as Batman's sidekick for ten years as the boy wonder, Robin. However, Nick is now 18 and after a fight with Batman over Nick's girlfriend Barbara Gordon earning the duo's identities as well as her taking on the mantle of Batgirl. As a result, Robin and Batgirl move to Bludhaven as they attempt to find their footing outside of Batman's shadow.

Protagonists: Antagonists:
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * David Ramsey as John Diggle/Spartan
 * Katherine McNamara as Helena Bertinelli/Huntress
 * Letitia Wright as Raya Vestri
 * Kaya Scodelario as Elise Svoboda
 * Jensen Ackles as Bruce Wayne/Batman
 * Tanner Buchanan as Jason Todd/Red Hood
 * John Barrowman as Slade Wilson/Deathstroke (S1)
 * Manu Bennett as Mark Desmond/Blockbuster (S2)
 * The Court of Owls (S3)
 * Neal McDonogh as Damien Darhk (S4)
 * Josh Segarra as Heartless (S5)
 * Kirk Acevedo as Ricardo Diaz/The Dragon (S6)
 * Alexander Siddig as Ra's al Ghul & The League of Assassins (S7)

Harley & The Sirens
Airing: 2019-

Seasons:

Plot: It's open season on Harley Quinn when her explosive breakup with the Joker puts a big fat target on her back. But things soon even out for Harley when she becomes unexpected allies with two deadly women -- Catwoman and Poison Ivy. Now, the three must learn to work together and form bonds they had given up hope on making.

Protagonists: Antagonists:
 * Jane Levy as Dr. Chase Meridian/Harley Quinn
 * Jurnee Smollett as Dr. Pamela Isley/Poison Ivy
 * Melissa Fumero as Selina Kyle/Catwoman
 * Marsai Martin as Harper Row/Bluebird
 * DeLijah McAlpin as Cullen Row
 * Dianna Agron as Holly Robinson
 * Jensen Ackles as Bruce Wayne/Batman

Joker's Law
Airing: December 2-3, 2019

Crossover: Nightwing & Harley & The Sirens

Plot: It's Christmas Eve in Gotham City and the Joker (with the help of his new assistant Punchline) breaks out of Arkham Asylum, causing the city to go into lockdown with Batman forcing Selina, Nick, Barbara, Jason, and Tim to stay locked down as well. However, figuring that one mortal man can't be that dangerous, only Selina and Tim stay in the Batcave, causing fateful reprecussions.

Protagonists: Antagonists: Jared Padalecki as The Joker & Alexis Kaye/Punchline
 * Jensen Ackles as Bruce Wayne/Batman
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * Melissa Fumero as Selina Kyle/Catwoman
 * Jane Levy as Dr. Chase Meridian/Harley Quinn
 * Jurnee Smollett as Dr. Pamela Isley/Poison Ivy
 * Tanner Buchanan as Jason Todd/Robin
 * David Ramsey as John Diggle
 * Kevin Conroy as Jim Gordon
 * Asher Angel as Tim Drake
 * John Cleese as Alfred Pennyworth

Deaths: Tanner Buchanan as Jason Todd/Robin

The New Teen Titans
Airing: 2021-26

Seasons: 5

Plot: Leading the new Teen Titans to protect Earth is Robin, formerly Batman's sidekick. He has no special powers, just a utility belt and his mind to help solve problems. His team members, Starfire, Raven, Cyborg, and Beast Boy live together in Titans Tower, situated in the west coast haven Jump City. Each of them possesses unique abilities to help fight a new generation of villains ranging from super-powered hooligans to would-be world conquerors.

Protagonists: Antagonists:
 * Asher Angel as Tim Drake/Redwing
 * Storm Reid as Koriand'r/Starfire
 * Dafne Keen as Rachel Constantine/Raven
 * Forrest Wheeler as Gar Logan/Beast Boy
 * Miles Brown as Victor Stone/Cyborg
 * Joseph Morgan as Sebastian Blood VIII/Brother Blood (S1)
 * John Barrowman as Slade Wilson/Deathstroke (S2)
 * CADMUS (S3)
 * Damaris Lewis as Queen Bee (S4)
 * Dafne Keen as Rachel Roth/Daughter of Darkness (S5)

Heart of Hush
Airing: November 30-December 2, 2021

Crossover: Nightwing & Harley & The Sirens

Plot: After learning of the Black Glove's conspiracy to kill Batman, Hush decides to strike again and take the glory away from them. For this, Hush targets Batman's close people and loved ones, being the most important one Selina Kyle, a.k.a. Catwoman. Hush kidnaps her and surgically removes her heart, leaving a series of clues and challenges that would lead Batman to Catwoman's salvation or to his own damnation.

Protagonists: Antagonists: Deaths: Peter Stormare as Dr. Aesop
 * Jensen Ackles as Bruce Wayne/Batman
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * Melissa Fumero as Selina Kyle/Catwoman
 * Jane Levy as Dr. Chase Meridian/Harley Quinn
 * Jurnee Smollett as Dr. Pamela Isley/Poison Ivy
 * David Ramsey as John Diggle/Spartan
 * Kevin Conroy as Jim Gordon
 * Asher Angel as Tim Drake/Brother Eye
 * John Cleese as Alfred Pennyworth
 * Penn Badgley as Dr. Thomas Elliot/Hush
 * Tom Cavanagh as Dr. Jonathan Crane/The Scarecrow
 * Robert Knepper as Sean Riley/The Ventriloquist
 * Peter Stormare as Dr. Aesop

Doom Patrol
Airing: 2022-

Seasons: TBD

Plot: The members of the team have found their purpose through the Chief and have come together to investigate some of the world's weirdest phenomena. After The Chief mysteriously disappears, though, the reluctant heroes find themselves called to action by Cyborg, who comes to them with a mission that they cannot refuse. Doom Patrol -- part support group, part superhero team -- is a band of superpowered freaks fighting for a world that wants nothing to do with them.

Protagonists: Antagonists:
 * Diane Guerrero as Crazy Jane
 * April Bowlby as Rita Farr/Elasti-Girl
 * Matt Bomer as Larry Trainor/Negative-Man
 * Brendan Fraser as Cliff Steele/Robot-Man
 * Timothy Dalton as Niles Caulder/The Chief
 * Miles Brown as Vic Stone/Cyborg
 * Alan Tudyk as Eric Morden/Mr. Nobody (S1)
 * Brandon Perea as Dr. Johnathan Tyme (S2)
 * Jonathan Lipow as Monsieur Mallah (S3)

Under the Red Hood
Airing: December 1-3, 2022

Crossover: Nightwing & Harley & The Sirens

Plot: Gotham has fallen under the control of Black Mask. Batman has been separated from the rest of the Bat-Family, and most of his villains have been locked away in Arkham Asylum. The streets begin drowning in blood as Black Mask’s empire begins to crumble at the hands of the Red Hood. Getting desperate to keep control of his empire, Black Mask breaks the Joker out from Arkham leading to a fateful confrontation that will change Batman’s life forever.

Protagonists: Antagonists: Deaths: Peter Outerbridge as Roman Sionis/Black Mask
 * Jensen Ackles as Bruce Wayne/Batman
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * Melissa Fumero as Selina Kyle/Catwoman
 * Kevin Conroy as Jim Gordon
 * Asher Angel as Tim Drake/Brother Eye
 * John Cleese as Alfred Pennyworth
 * Tanner Buchanan as Jason Todd/Red Hood
 * Jared Padalecki as The Joker
 * Peter Outerbridge as Roman Sionis/Black Mask

Gotham Knights
Airing: December 1-4, 2023

Crossover: Nightwing, Harley & The Sirens, & The New Teen Titans

Plot: Protagonists:
 * Jensen Ackles as Bruce Wayne/Batman
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * Melissa Fumero as Selina Kyle/Catwoman
 * Asher Angel as Tim Drake/Robin
 * Kevin Conroy as Jim Gordon
 * John Cleese as Alfred Pennyworth

Antagonists:

Deaths:

Peacemaker
Airing: 2024-27

Seasons: 3

Plot: After recovering from the injuries he suffered fighting as apart of Task Force X, Peacemaker is forced to join the mysterious A.R.G.U.S. black ops squad "Project Starfish". They are on a mission to identify and eliminate parasitic starfish-like creatures who have taken over human bodies around the world.

Protagonists: Antagonists:
 * Jeremy Allen White as Christopher Smith/Peacemaker
 * Danielle Brooks as Leota Adebayo
 * Ethan Cutkosky as Adrian Chase/Vigilante
 * Jennifer Holland as Emilia Harcourt
 * Steve Agee as John Economos
 * Chukwudi Iwuji as Clemson Murn (S1)
 * Starro (S1)
 * Robert Patrick as Auggie Smith/White Dragon (S1)

Knights Fate
Airing: December 2-3, 2024

Crossover: Nightwing & Batwoman

Plot:

Protagonists: Antagonists: Alexander Siddig as Ra's al Ghul & The League of Assassins
 * Jensen Ackles as Bruce Wayne/Batman
 * Ryan Potter as Nick Grayson/Nightwing
 * Camilla Mendes as Kate Wayne/Batwoman
 * Bodhi Sabongui as Damian Wayne
 * Kiera Allen as Barbara Gordon/Oracle
 * David Ramsey as John Diggle/Spartan

Deaths:

Gotham Knights End
Airing: December 1-5, 2025

Crossover: Nightwing, Harley & The Sirens, The New Teen Titans, & Batwoman

Plot:

Protagonists: Antagonists: Deaths: Jensen Ackles as Bruce Wayne/Batman
 * Jensen Ackles as Bruce Wayne/Batman
 * Bodhi Sabongui as Damian Wayne/Robin
 * Ryan Potter as Nick Grayson/Nightwing
 * Kiera Allen as Barbara Gordon/Oracle
 * Melissa Fumero as Selina Kyle/Catwoman
 * Asher Angel as Tim Drake/Redwing
 * David Ramsey as John Diggle/Spartan
 * Kevin Conroy as Jim Gordon
 * John Cleese as Alfred Pennyworth
 * Laz Alonso as Eduardo Durrance/Bane
 * Misha Collins as Harvey Dent/Two-Face
 * Tanner Buchanan as Jason Todd/Batman

Red Hood & The Outlaws
Airing: 2026-

Seasons:

Plot:

Protagonists: Antagonists:
 * Tanner Buchanan as Jason Todd/Red Hood
 * Haley Tju as Rose Wilson/Ravager
 * Lucas Jade Zumann as Connor Kent/Superboy