The DCTV/Arrowverse started with Greg Berlanti started Arrow back in 2012. DC Comics has vast heroes and some double up with the TV universe and the movie universe such as The Flash and Superman. Here I try to put which heroes have been adapted. Some characters don't come directly from comics, some recast and others changed. This is a guide to which series they have appeared in. There is probably more, I'll add when I remember.
Oliver Queen/Arrow
Actor: Stephen Amell
Series: Arrow
Has appeared in: The Flash, Legends of Tomorrow
Series: Arrow
Has appeared in: The Flash, Legends of Tomorrow
Roy Harper/Arsenal
Actor: Colton Haynes
Series: Arrow Seasons 1-3
John Diggle/Spartan
Actor: David Ramsey
Series: Arrow
Has appeared in: The Flash, Legends of Tomorrow
He is an original creation, not from the comics.
Laurel Lance/Black Canary
Actress: Katie Cassidy
Series: Arrow, The Flash
Thea McQueen/Speedy
Actress: Willa Holland
Series: Arrow
Has Appeared in: The Flash
She took over Roy's place and then retired but helped in "Heroes vs Aliens."
Sarah Lance/White Canary
Actress: Jacqueline MacInnes Wood and Caity Lotz (Season 2 onward)
Series: Arrow, Legends of Tomorrow
Has appeared in: The Flash
She technically doesn't exist in the comics but mostly based on Black Canary. She was recast in season 2 of Arrow and now a regular in Legends of Tomorrow.
Lyla Michaels/Harbringer
Actress: Audrey Marie Anderson
Series: Arrow
Has appeared in: The Flash
Where she has taken the name of Harbringer, she is not an active hero. She did appear in the "Heroes vs. Aliens" teamup.
Barry Allen/The Flash
Actor: Grant Gustin
Series: The Flash
Has appeared in: Arrow, Supergirl, Legends of Tomorrow
Catilin Snow/Killer Frost
Actress: Danielle Panabaker
Series: The Flash
Has appeared in: Arrow, Legends of Tomorrow
While a villain in the comics, she has been mostly a hero in the series. In Season 2 of Flash, she met Earth-2 Killer Frost who was a villain. Now in Season 3, her powers have arose and her evil personality. Even though she didn't use her powers, she was useful in the "Heroes VS Aliens" crossover.
Cisco Ramon/Vibe
Actor: Carlos Valdez
Series: The Flash
Has appeared in: Arrow, Supergirl, Legends of Tomorrow
He is the only one from the Arrowverse other than Flash that has appeared in Supergirl.
Jesse Wells/Jesse Quick
Actress: Violette Beane
Series: The Flash
In the series, she comes from Earth-2 and daughter of Harrisons Wells. She returns to Earth-2 in Season 3. In the comics, she is the daughter of Johnny Quick.
Wally West/Kid Flash
Actor: Keiynan Lonsdale
Series: The Flash
He first came in season 2 and got his powers in season 3.
Jay Garrick/the Flash Earth-3
Actor: John Wesley ship
Series: The Flash
season 2
Martin Stein/Firestorm
Actor: Victor Garber
Series: The Flash/Legends of Tomorrow
He was part of the Heroes vs Aliens teamup.
Ronnie Raymond/Firestorm
Actor: Robbie Amell
Series: The Flash
He was killed off in Season 2. He appeared in season 3 as Deathstorm in Earth-2.
Jefferson Jackson/Firestorm
Actor: Franz Drameh
Series: Legends of Tomorrow
Seen in: The Flash
He was not in the comics, Ronnie's replacement in the comics was Jason Rusch.
Mick Rory/Heatwave
Actor: Dominic Purcell
Series: The Flash/Legends of Tomorrow
Was part of "Heroes vs Aliens"
Leonard Snart/Captain Cold
Actor: Wentworth Miller
Series: The Flash/Legends of Tomorrow
"Killed" off in Season 1 of Legends but later reappears.
Ray Palmer/The Atom
Actor: Brandon Routh
Series: Arrow Season 3/Legends of Tomorrow
Appeared in: The Flash
Rip Hunter
Actor: Arthur Darvill
Series: Legends of Tomorrow
Carter Hall/Hawkman
Actor: Falk Hentschel
Series: Legends of Tomorrow
Appeared in: The Flash (Season 2), Arrow (Season 4)
Killed off but later reappeared again.
Kendra Saunders/Hawkgirl
Actress: Ciara Renee
Series: Legends of Tomorrow
Appeared in: The Flash (Season 1), Arrow (Season 4)
Curtis Holt/Mr Terrific
Actor: Echo Kellum
Series: Arrow Season 4-on
In the comics, his name is Michael. Part of Heroes vs Aliens, he met the Flash and Supergirl
Tobias "Charon" Church/Ragman
Actor: Joe Dinicol
Series: Arrow Season 5
Part of Heroes vs Aliens, he met the Flash and Supergirl
Rene Ramirez/Wild Dog
Actor: Rick Gonzalez
Series: Arrow Season 5
Part of Heroes vs Aliens, he met the Flash and Supergirl
John Diggle Jr/Green Arrow
Actor: Joseph David-Jones
Series: Legends of Tomorrow
His storyline is of Connor Hawke but in the series, he is the son of John Diggle and Lyla Michaels, being made from Flash's Flashpoint.
Marie Jiwe McCabe/Vixen
Actress: Megalyn Echikunqoke
Series: Vixen (animated)
Appeared in: Arrow Season 4
She was in an animated series online and then moved to a guest spot on Arrow.
Amaya Jiwe/Vixen
Actress: Maisie Richardson-Sellers
Series: Legends of Tomorrow (Season 2)
When they couldn't get Megalyn Echikunwoke, they hired Maisie and made the character her grandmother.
Stargirl
Actress: Courtney Whitmore
Series: Legends of Tomorrow
Appears as part of the early JLA.
Henry Heywood / Commander Steel
Actor: Matthew McCaull
Is grandfather to Nate, part of early JLA
Nate Heywood/Commander Steel
Actor: Nick Zano
Series: Legends of Tomorrow Season 2
Has appeared in: Arrow
Kara Danvers/Supergirl
Actress: Melissa Bensoit
Series: Supergirl
Has appeared in: The Flash, Arrow, Legends of Tomorrow
In her own Earth, which Cisco calls Earth-31, there only exists Superman and her. And perhaps Batman, as Gotham has been mentioned.
J'onn J'onzz/Martian Manhunter
Actor: David Harewood
Series: Supergirl
Clark Kent/Superman
Actor: Tyler Hoechlin
Series: Supergirl
Jimmy Olsen/Guardian
Actor: Mehcad Brooks
Series: Supergirl
The Guardian was Jim Harper in the comics but he already appeared on Supergirl so now Jimmy Olsen is the Guardian on the show.
