Learning of the pipeline
When a police cruiser camera apparently caught Detective Eddie Thawne shooting two officers without warning, Cecille interrogates Thawne at CCPD. Despite Captain David Singh unwilling to believe Thawne to be capable of murder and Barry Allen pointing out lack of powder burns on his clothes, Cecille refused to be moved. Later, she, Singh and Barry watched security footage of the Flash fighting Hannibal Bates, who shape-shifted into multiple forms, including Thawne's. Cecille remarked that law wasn't ready for meta-human criminals. After dropping the charges against Thawne, Barry provided evidence for Cecille to exonerate Bates' other victims he framed for his crimes.
Working alongside Joe West
Over a year later, she informed Joe that the D.A.'s office had no information on Alchemy and guessed that his inquiry was meta-human-related. Later, she and Joe visit Rosa Dillon at Iron Heights for information on the whereabouts of her boyfriend Sam Scudder, who gained power over mirrors, according to a former associate of Leonard Snart, who was assaulted by Scudder. As soon as they were done questioning her, Scudder appeared and broke Dillon out using meta-human powers. After Scudder and Dillon were apprehended by the Flash and Jesse Quick, and sent to Iron Heights, Barry assured Cecille and Joe that Scudder couldn't Mirror Master his way out because his cell was lined with an anti-reflective material. Afterwards, she asked Joe out on a date, but he declined, stating that he had movie night with his kids.
Cecille and Joe meet again during Christmas when they toast to their grandmothers (and their respective eggnog recipes), then they kiss. Cecille is seen again with Joe, before Iris and Wally steal the papers on arms dealer from their father.
Later, Cecille goes for coffee with Joanie, her daughter in the company of Barry, Iris, Wally and Joe before Clive Yorkin arrives for Joe. Wally as Kid Flash succeeds to flee him and save the rest of the group. Cecille and Joe go on another date with Barry and Iris.
Love relationship with Joe West and ally of Team Flash
Cecille and Joe were seen again after a race and they kissed before Joe received a call, forcing him to leave Cecille. Cecille was then kidnapped by Killer Frost in exchange for Tracy Brand, the only person who could stop Savitar. But her plan failed and Cecille was saved. Soon after, Joe admitted his love to Cecille and told her about Barry and Wally's alter egos.
Soon after this Barry went through an experiment to try and prevent himself from creating new memories in an effort to stop Savitar from using his knowledge of the future against the team, However the experiment failed and left Barry with temporary amnesia. At the same time the trial for Lucious Coolidge was moved to an earlier time. This caused Cecille to call in Barry as he was the CSI officer assigned to the case because he needed to testify in court however he still had amnesia, much to her dismay. She attempted to work with the problem until it backfired, causing Coolidge to walk free and terrorize the city again.
Cecille was talking to Joe about how they are going to live their life. Cecille makes the decision of moving to a different home. But when Hazard releases bad luck to many, the West Residence falls apart slowly. After Cecille put new coats on the wall, Joe wanted to move but Cecille changed her mind and then wanted to live at the West residence. Cecille revealed to be pregnant and Joe didn't know how to react.
Shortly after this she stepped down from being the DA in order to be Barry's lawyer after he was framed for Clifford DeVoe's murder; despite this he was still sentenced to jail. After Barry was sentenced Cecille discovered that due to being in the city of the time Particle accelerator explosion she acquired the gestational meta ability of being telepathic, though it remained unclear whether the power was actually Cecille's, or if it was her future daughter's.
After Harry lost his intelligence by overloading his thinking cap, Joe asked him to distract her for a while. Harry and Cecille discovered together that Harry would lose all his knowledge with time, but Cecille could read Harry's ideas so Team Flash learned that DeVoe's plan was to strip anyone of their intelligence.
When DeVoe launched the satellites to start the Enlightenment (the name of his plan), Iris encouraged Marlize to help them to stop said plan. After all of them went to the pocket dimension, Marlize insisted that the only way to stop DeVoe was to enter to his mind, and Cecille with the cerebral inhibitor was part of the entrance there. Barry was put in the hoverchair and wore the cerebral link helmet to enter them. The problem was that if Cecille bore the baby, Barry might be trapped in DeVoe's mind forever.
When DeVoe arrived for them, he used Null's powers on them all except Joe, and after failing to make Joe shoot himself, DeVoe started to choke Cecille although she was pregnant. Since Barry and Ralph left the portal, DeVoe was losing Ralph's possessed body and all his powers ceased blocking Team Flash and Marlize. Ralph recovered control of his body, but DeVoe could send himself to the hoverchair with Kilg%re's powers. When Marlize unplugged his program, DeVoe made the satellite Sally fall to Central City.
Seen as flirty, but serious when it comes to her job as Central City's District attorney, Cecille is a kind woman who thinks the world of her newfound family, the Wests and Team Flash. As a single mother of a teenage daughter, Cecille understands Joe's struggles of when he was raising Iris and Barry. She loves Joe and the life they have started building together, and has long since come to think of Iris, Wally and Barry as her own. Known to be competitive, Cecille isn't one to back down from a challenge.
When it comes to her work, Cecille doesn't allow her personal life effect her job. When she discover that she was telepathic, she showed excitement as she believed that these new-found powers would make her more of an asset for Team Flash.
She is also self conscious about her appearance. When she was several months pregnant, Cecile worried about how others thought about how she looked.
Powers and Abilities
- Telepathy: From unknown means, Cecile developed a minor form of telepathy, able to hear the thoughts of anyone near her. Caitlin Snow theorized that this may have been brought on by her pregnancy activating residual dark matter in her body from the first particle accelerator. After giving birth to Jenna West, these powers were terminated.
- Empathy: An ability Cecille showed near the final stages of pregnancy. If a person was close enough to her, Cecille started to act like the said person, such as when Caitlin was nervous, Cecile became nervous. It can go to the point where Cecille can actually believe she is the said person.
- High-level intellect/Master lawyer: Cecille is very intelligent, as the District attorney of Central City, she is an excellent lawyer; as Cecille has successfully prosecuted many criminals and has rarelyr lost a case.
- Network: As the District attorney, Cecille has access to the resources of her office and the Central City Police Department.
The Chronicles of Cisco
- It’s been highly implied that Cecile is religious, as she has convinced Joe to go to church and taught him how to pray.
Behind the scenes
- In the DC comics, Cecile Horton was a character in the "Trial of The Flash" storyline, where, as in the show, she was Barry Allen's defense attorney when he was on trial for murder and ultimately failed to sway the jury in his favor. However, unlike on the show, Barry was actually guilty of the murder in the comics.