Detective McKenna Hall is a temporarily-former police detective of the Starling City Police Department. She is also an old friend/the ex-girlfriend of Oliver Queen, an old friend of the late Tommy Merlyn, and the sister of an unnamed woman. When Oliver needed help to take down Vertigo, he went to her for the police's file on The Count. She later went on two dates with Oliver and shared a kiss with him. She later began a romantic relationship with Oliver. McKenna at the same time was chosen by Quentin Lance to be his partner in uncovering the Hood's identity. This romantic relationship, however, ended after she was shot by Helena Bertinelli, and became temporarily paralyzed. Due to this, she had to move with her sister to Coast City, which she claimed has the best physical therapy facility in the country.
She has a history with Oliver. Prior to Oliver's shipwreck on Lian Yu, she was a fellow partygoer of Oliver's. She was once banned from a bar for taking off her clothes. She mentioned that there was no signs around saying that she could not take off her clothes. While Oliver was supposedly dead for 5 years, McKenna became a police officer.
In "Vertigo", Oliver encounters McKenna at the SCPD station. Happy to see each other Oliver notes his amazement that she has, become a cop. He talks to her trying to find info about The Count. McKenna gives him what little Information the police have on him. Later when Oliver is doing a deal with The Count, McKenna along with Lance disrupt the deal with the Count escaping. At the Queen Mansion Lance and McKenna confront Oliver about the incident with her revealing that she spotted Oliver at the scene. When the Hood nearly overdoses the Count Lance and McKenna arrive with Lance telling him that his actions prove that he is what he always thought he was: a murderer. McKenna contacts Oliver the next day and tells him the news saying It was good seeing him again.
In "Dodger", Oliver flirts with McKenna to implant a chip on her phone to eavesdrop on her conversations about the Dodger and also at the same time asked her out. They went on a date which was going well until McKenna unintentionally mentions his life on the island. McKenna then got a call regarding the dodger and had to leave the date as awkward as it is. Although the new spark of the romance still ended well for them in the end.
In "Dead to Rights", Oliver and McKenna continue their possible relationship and even talk about fitting it in both of their busy lives. When McKenna says she is willing to do it, Oliver was delightful.
In "The Huntress Returns", As Oliver's club Verdant is opening, Oliver asks McKenna to be his date for the night. McKenna and Quentin arrest The Huntress as she fell for the trap they set which was sending two empty vans, making Oliver and Helena believing one of them carried Frank Bertinelli. McKenna and Quentin ask Helena who The Hood is, she tells them it's Oliver Queen but the two don't believe her. During Helena's pursuit for her Father, McKenna calls for backup and approaches Oliver and McKenna. McKenna tells both The Hood and The Huntress to hold their ground and surrender, the Huntress fires her shotgun at her. Though McKenna was wearing a vest, she was still harmed by a bullet. She tells Oliver she is leaving the city, though Oliver says he will follow her, McKenna tells him to stay.
McKenna is a very honest person and is very passionate about her work as a police detective. She is similar to Quentin Lance, believing in law and order and is, therefore, against the actions of the vigilante.
- "The Calm" (mentioned)
- McKenna Hall is possibly named after a character from Batman comics, Melody McKenna of the Gotham City Police Department, who also has a similar dislike for vigilantes.
- The last name of Hall is a popular named used amongst DCU characters, amongst them Carter Hall and Shiera Sanders Hall, also known as Hawkman and Hawkgirl.
- At the San Diego Comic Con, it was revealed that McKenna Hall was originally planned to be killed off but kept due to how audience members took to her. She was also mentioned to possibly come back to Starling City in the second season, however this never happened.
- Her first name "McKenna" is the last name of Stephen Amells character on Blue Mountain State, religious quarter back Travis McKenna.
- She is possibly related to Carter Hall, as they share the same last name.