Nick Salvati Nick Salvati (portrayed by
Tahmoh Penikett) is the right-hand man of Frank Bertinelli.
Derek Sampson Derek Sampson (portrayed by
Cody Runnels) is a drug dealer terrorizing Star City. He is exposed to a chemical compound called "Stardust", which makes him unable to feel pain. In season seven, he appears as an inmate at Slabside Maximum Security Prison. When Ricardo Diaz takes control of the prison, Derek assists him in attacking Oliver. When Diaz starts an electrical fire, Sampson is set on fire by Ben Turner.
Kendra Saunders / Hawkgirl Kendra Saunders / Hawkgirl (portrayed by
Ciara Renée) is a young woman who is just beginning to learn that she has been repeatedly reincarnated over the centuries. When provoked, her ancient warrior persona manifests itself, along with wings that grow out of her back, earning her the name Hawkgirl. Renée stars as the character on
Legends of Tomorrow.
Vandal Savage Vandal Savage (portrayed by
Casper Crump) is a 4,000-year-old immortal, who has manipulated leaders throughout history in an attempt to gain dominion over the entire world. He becomes a main antagonist in the first season of
Legends of Tomorrow. Mark Scheffer / Shrapnel Mark Scheffer / Shrapnel (portrayed by
Sean Maher) is a former toy-shop owner who becomes a psychotic serial bomber and later a member of the Suicide Squad.
Shado Shado (portrayed by
Celina Jade) is the daughter of Yao Fei. She helps train Oliver in
archery and martial arts while on Lian Yu in the season one flashbacks; they eventually become lovers during the season two flashbacks. She is killed by Ivo causing Slade, who had secretly been in love with her, to blame Oliver for her death and vows revenge. She later appears in Slade's hallucinations in the present time. Jade also portrayed Shado's twin sister, Mei, who Oliver meets in Hong Kong during a season three flashback. She also appears as a hallucination in season four during Oliver's second stay on Lian Yu.
Evelyn Sharp / Artemis Evelyn Crawford Sharp (portrayed by
Madison McLaughlin) is a woman who takes up the mantle of the Black Canary following Laurel's death, eventually settling on the name
Artemis. After imitating Black Canary, she ran afoul of Arrow after threatening revenge on Damien Darhk. She becomes one of the new recruits of Team Arrow despite her moral ambiguity and hatred for
H.I.V.E., but ultimately betrays the team to Prometheus after learning about the List and Oliver's former identity as the Arrow. She is on Lian Yu when it was blown up by Prometheus, with her fate never revealed.
Mark Shaw Mark Shaw (portrayed by
David Cubitt. In the third-season episode "Corto Maltese", he is the liaison
A.R.G.U.S. agent to Corto Maltese, who has gone off the grid and is unreachable.
Lyla Michaels asks John Diggle to check-up on Shaw while he visits the island. Diggle finds Shaw who is in the midst of a critical undercover mission with a local cartel and offers him to help. Soon after, Shaw betrays him and steals an A.R.G.U.S. thumbdrive. Oliver Queen,
Roy Harper and Diggle ambush the trade between Shaw and the cartel. After Diggle defeats him, Shaw claims
Amanda Waller drove him to his insubordination. Shaw begged Diggle to tell Waller he killed Shaw so Shaw can go back to living a normal life. Diggle, knowing full well what Waller was capable of, knocked him out but agreed to do so. In "Al Sah-him", it is revealed that he became ally to
H.I.V.E. and, under the orders from
Damien Darhk, went to Corto Maltese to draw A.R.G.U.S. agents and obtain secret files.
Sheck Sheck (portrayed by Tobias Jelinek) is the right-hand man of Cayden James and a member of his secret cabal. He is responsible for saving Black Siren following the detonation of Lian Yu, ensuring her loyalty to his boss's cause. Scheck is later killed by Vigilante, revealing the latter's nature as a mole in the group.
Matthew Shrieve Matthew Shrieve (portrayed by
Marc Singer) is a US Army General who is introduced in a flashback at the end of the episode "The Return". He serves as a main antagonist of the third season flashbacks. Shrieve presents himself as a more reasonable counterpart to Amanda Waller, allowing Oliver and the Yamashiros to go free after their mission in Hong Kong is completed; he is later revealed to be the one who ordered their deaths, betraying and framing Waller as he plots to use the virus they acquired to cripple China, which he sees as a growing threat to America. Shrieve is also responsible for causing Akio's death and in vengeance he is brutally tortured by Oliver before being executed by Maseo.
Jake Simmons / Deathbolt Jake Simmons / Deathbolt (portrayed by
Doug Jones) is a metahuman from
Opal City who receives his powers through unknown means, with the ability to harness and weaponize plasma energy.
Cindy "Sin" Simone Cindy "Sin" Simone (portrayed by
Bex Taylor-Klaus) is a wayward youth whom Sara takes under her protection in Starling City after Cindy's father is killed on Lian Yu. Cindy later befriends Roy Harper and Thea Queen.
David Singh David Singh (portrayed by
Patrick Sabongui) is the Central City Police Captain who provided the Green Arrow and his team with information that lead to the location of Dinah Drake. Sabongui reprises his role from
The Flash.
Donna Smoak Donna Smoak (portrayed by
Charlotte Ross), a former
cocktail waitress from
Las Vegas, is Felicity's mother and
Mia Smoak's maternal grandmother. Donna was previously married to cyber-criminal Noah Kuttler which led to Felicity's conception prior to leaving him; Donna claimed that Noah abandoned them, resulting in an estranged relationship with Felicity until they reconcile seventeen years later. Donna meets and dates Quentin Lance, but remains bitter over Noah and his criminal past. She helps Quentin to cope with the loss of his eldest daughter, Laurel. As of the season five premiere, Donna and Quentin have split up. Donna and Quentin eventually end up getting married in the season seven finale, we later find out she gets pregnant and gives birth to Felicity's younger brother Noah Lance.
Caitlin Snow / Killer Frost Caitlin Snow / Killer Frost (portrayed by
Danielle Panabaker) is a bio-engineering expert from
S.T.A.R. Labs and a metahuman with cryokinetic abilities. Caitlin helps Felicity in recreating the Mirakuru antidote, and occasionally helps Team Arrow on missions. Panabaker stars as the character on
The Flash.
Vincent Sobel / Vigilante Vincent "Vinnie" Sobel / Vigilante (portrayed by
Johann Urb, voiced by
Mick Wingert when masked) is a crimefighter who kills criminals. He is revealed to be a member of Cayden James' criminal cabal, but is working as a double agent who informs Team Arrow of their activities, primarily because of his love for Dinah. Vincent is eventually caught and killed by Black Siren for his betrayal. Despite belief that Josh Segarra voiced the character, thus implying that Adrian Chase was also Vigilante (as is the case in the comics), it was revealed that his character was instead Prometheus. As such, Guggenheim indicated that the reveal of who Vigilante actually was would "probably" not be seen in season five and that Vigilante's identity was someone already seen before. Sobel was originally portrayed by
Clayton Chitty in the fifth season.
Sean Sonus Sean Sonus (portrayed by
Steve Bacic) is a drug dealer who killed Central City Police Department officer Vincent Sobel during the
S.T.A.R. Labs particle accelerator incident in season two of
Arrow and got powers as a metahuman to further his criminal enterprise. Sean is hunted across the country by Dinah Drake until they meet again in
Hub City.
Kate Spencer Kate Spencer (portrayed by
Chelah Horsdal) is the district attorney. She is killed in season two during Slade Wilson's rampage on Starling City.
Walter Steele Walter Steele (portrayed by
Colin Salmon) is Moira's husband, Oliver and Thea's step-father, and Felicity's former employer. He was president of Queen Consolidated until he disappeared in episode 9, but was found alive in episode 21. He and Moira separate at the end of season one, and he returns in season two to help her run for mayor. It is revealed that Moira had confided in Walter about Thea's true paternity at some point after they marry. He is currently the
chief financial officer of Starling National Bank.
Martin Stein / Firestorm Martin Stein / Firestorm (portrayed by
Victor Garber) is a nuclear physicist focused on transmutation who is second half of the hero known as Firestorm with Jefferson Jackson. Garber reprises his role from
The Flash.
Jason Stent Jason Stent (portrayed by
Chris Milligan) is a weapons dealer who was defeated by Emiko Queen when Oliver Queen is incarcerated at Slabside Maximum Security Prison.
Roy Stewart General Roy Stewart (portrayed by
Ernie Hudson) is John Diggle's step-father and a former U.S. Marine Corps lieutenant, who works in the
Defense Intelligence Agency. He is introduced in ''Arrow's'' seventh season, in the episode "Spartan". He and Diggle have a strained relationship caused by Diggle's belief that Stewart abandoned his father during an operation, which led to his death, as well as the rigorous marine training he put the Diggle brothers through after marrying their mother. Actually, Diggle's father's death was caused by his own negligence and Stewart saved the rest of the unit, but Stewart has not corrected Diggle's view of the situation, wanting him to see his father as a hero. When Diggle learns what really happened, he and Stewart make amends. ==T==