Dr. Will Halstead
An attending physician at Chicago Med's ED, where he was previously the senior resident. Formerly a plastic surgeon, Will is a reliable guy to have both in and outside the ER, but has a tendency to go overboard when looking out for the welfare of his patients and being impulsive in regards to his relationships with his colleagues. Will is the older brother of Detective Jay Halstead of the CPD.
- Betty and Veronica:
- Betty: Zoe Roth, a pharmaceutical rep who's done everything short of throwing herself on Halstead to show she's attracted to him, even calling in huge professional favors to help him. His interactions with her don't go beyond friendly flirting.
- Veronica: Natalie Manning, his colleague. He's thrown himself at her to show her he cares but she's still mourning the recent death of her husband and coming to grips with being a single mother.
- The Casanova: Halstead is first introduced having had a habit of picking up women, even married women.
- Character Development: Introduced on Chicago P.D. as Jay Halstead's carefree, reckless brother who spends his nights partying, picking up women, getting into trouble and moving from one job opportunity to another to Jay's chagrin. After a bomb incident at Gaffney's Medical Center during the back-door pilot on Chicago Fire, he goes out of his way to step up and goes up and over for all injured, and at the end of the day, decides to stay in Chicago eventually becoming a more responsible and stable doctor, dropping his womanizing ways and becoming the senior resident by the series' pilot.
- Chick Magnet: He's had the attention of Natalie - the primary object of his affections - Zoe and Nina. This was before his womanizing ways at before the start of the series.
- Fiery Redhead: He has fairly bright red hair and the passionate personality to match.
- Green-Eyed Monster: Briefly towards new med student resident Jeff Clarke when he clearly sees sparks between him and Natalie.
- Hot-Blooded: Rather stubborn and has a tendency to make impulsive decisions regarding his patients' welfare that he risks being fired and losing his license.
- Missing Mom: His and Jay's mother died from cancer.
- Nice Guy: Despite his flaws - being overly eager, stubborn and sometimes impulsive - he's an all round reliable guy to have as a friend.
- No Good Deed Goes Unpunished: In Season 1 "Choices", he discovers a potential trial treatment for a terminal cancer patient and pressures her husband into breaking her Do Not Resuscitate order so that she may participate in the treatment trials. When she flat lines he doesn't wait for his answer and resuscitates her. Although he's successful, he's then hit with a massive lawsuit, Sharon Goodwin threatens to fire him, and the patient is given a placebo rather than the actual drug before passing away. Subverted in the end though, when the husband tearfully thanks Halstead nonetheless for giving his family a little more time to spend with their wife and mother, and drops the lawsuit after she passes away.
- Reality Ensues: In Season 2, in the wake of the lawsuit filed against him, he finds that he has to pay drastically increased malpractice insurance premiums.
- Red Oni: Passionate, outspoken and overly eager, he's this to Dr. Connor Rhodes' Blue Oni.
- Ship Tease: With Natalie, Zoe, and Nina! The main object of his affections, though, is Natalie, and while she hasn't outward rejected him, she's hesitant to pursue a new relationship.
- Take a Third Option: In regards to his personal life. He decides not to pursue either of the women in his orbit in Season 1 (see Betty and Veronica above) and begins dating Dr. Nina Shore, the hospital's pathologist, in Season 2.
- Transplant: First appears as recurring on Chicago P.D. season 2 as Detective Jay Halstead's brother.
- "Well Done, Son!" Guy: Will aspires for his father Pat Halstead's approval whom he has strained relationship with. His father derided him for going to college and med school instead of going into work immediately.
- What the Hell, Hero?: Will's tendency to make overboard decisions both in his profession and his personal life has lead to a number of people (Natalie, Maggie, Sharon, Connor) calling him out on his actions.
Dr. Natalie Manning
A pediatrician doing a fellowship in emergency medicine. She is a native of Seattle, WA, and a widowed mother coping with loss of her husband Jeff, who was killed in action.
- Actor-Shared Background: she plays the violin.
- Adult Fear: After her Screaming Birth below.
- Amicable Exes: With Jeff Clark after they break up mid-season 2.
- Beware the Nice Ones: Natalie is a good supportive friend to have, but that's not to mean she'll just let others steamroll over her and won't call them out when she disagrees with them or piss her off. Just ask Will or Jeff.
- Brainy Brunette: Has brown hair and like most of the main cast she's a doctor.
- Broken Bird: She's still grieving the loss of her husband over the most of season 1.
- Friend to All Children: She's a pediatrician specialist, good with kids of all ages and on top of that she's a mom.
- Nice Girl: She's friendly, kind and helpful to everyone around, friends, colleagues or patients.
- Screaming Birth: She has a rather dramatic delivery while giving birth to her son Owen.
- Ship Tease: With Will over the first two seasons. During Season 1, Will makes his feelings for her known, but she's still grieving her late husband, so she gently dissuades his advances, though they become closer towards the end of Season 2, until in Season 3 they finally become a couple.
- Someone to Remember Him By: Her husband Jeff was killed in action prior to the birth of their child.
- When You Coming Home, Dad?: A gender-flipped example, Natalie herself invokes this trope in Season 2 "Generation Gap" noting that her long hours at the hospital leave little time for her son.
- Widow Woman: At the start of the series, she's grieving her late husband who was killed overseas.
Dr. Ethan Choi
Chicago Med ED's Chief Resident, completing his training as an emergency physician. He also has a background in infectious diseases.
- Aloof Older Brother: Has an adopted sister, Emily, who he hasn't had contact with for years because she makes bad decisions, hangs with the wrong crowd, he tried to help her out many times until he realized he couldn't let himself get involved with her drama any more.
- Birds of a Feather: With med student Jeff Clarke both of them having a military background, and are commonly seen working together. He also has this with Detective Halstead and CPD tech analyst "Mouse" both former Army rangers when they have drinks at Molly's together in Chicago PD episode "Forty Caliber Bread Crumb".
- Combat Medic: Prior to the series' time. He's a US Navy reservist who's been deployed to Afghanistan and recently completed a stint as a flight surgeon aboard the USS Carl Vinson.
- Fuzz Therapy: He adopts a parrot because he needs some sort of constant companionship to help treat his PTSD.
- Heroic BSoD: He's revealed to be suffering from a prolonged one, stemming from when a Afghani woman brought her dead child to him in the hope that he could provide treatment. Dr. Charles eventually starts to help him confront his issues.
- Hidden Depths: It's revealed in Season 2 he volunteers at the Chicago Zoo after adopting his parrot, and when a resident panda comes down with a heart defect, he pushed for the panda to be treated at the hospital.
- Hoist by His Own Petard: He begins his first day as Chief Resident filled with big ideas on how to improve the ED. Everything fails spectacularly before the day is over and, chastised, he goes back to the tried-and-true system that had been in place before.
- Mr. Fanservice: Now and then, including a few ShirtlessScenes.
- Perpetual Frowner: Rarely, if not never, smiles most of the time, given his generally stoic demeanour and dealing with his PTSD. Not so much anymore going into Seasons 2 and 3, especially after he starts going out with April.
- Relationship Upgrade: With April at the end of Season 2.
- There Are No Therapists: Averted. He goes into treatment with Dr. Charles to deal with his PTSD. By Season 2, he cheerfully extolls the virtues of therapy.
Dr. Daniel Charles
Gaffney Chicago Medical Center's Chief of Psychiatry. He often finds himself in the ED helping patients deal with trauma while also seemingly spending just as much time helping his colleagues deal with their personal issues. He's an alumnus of the University of Pennsylvania.
- Beware the Nice Ones
- Big Eater: He's frequently seen munching on one snack or another. Pork rinds seem to be a personal favorite of his.
- Da Chief: Chief of the hospital's psychiatry department.
- Omniglot: Says his third wife is from Spain.
- Parental Substitute: He becomes this for Reese, being encouraging and supportive of her.
- Parents as People
- The Shrink: Of the awesome variety. He's frequently shown to be the only character throughout the Chicago-verse who can get closed off characters to open up and confront their issues through a combination of compassion and mind games.
- There Are No Therapists: Averted, since he serves as the primary shrink for this show and the Chicago-verse in general. He's also in therapy himselfnote and is prescribed medication to help him cope with the stresses of his job.
Nurse April Sexton
A nurse in the ED, recently returned from a round-the-world trip to find herself. Her brother is an intern at Chicago Med. She's also old friends with Kelly Severide of the Chicago Fire Department, her family having taken him in after his parents' marriage fell apart.
- Big Sister Instinct: Towards her younger brother Noah, who's always a source of frustration and worry for her and tries to keep him in line.
- Break the Cutie:
- Chekhov's Gun: Between her introduction in Chicago Fire and Chicago Med's debut, she's said to have gone on a backpacking trip to "find herself". As it turns out, she contracted tuberculosis while overseas and the diagnosis and treatment of the disease comes to the forefront in Season 2.
- Crossover Ship: With a cling with Kelly Severide.
- Dude Magnet: She's had the attentions of her old friend Kelly Severide, Tate Jenkins a football player and now Dr. Choi.
- Foolish Sibling, Responsible Sibling: Kind, diligent, hardworking and protective, she's the responsible older sister to her brother Noah.
- Freudian Excuse: When season 3 starts, she insists that she and Ethan keep their Relationship Upgrade secret, because he's a doctor while she's a nurse, not wanting to start talk that he shows her favouritism. She gets over this by 3x05.
- Heterosexual Life-Partners: With Maggie and Natalie.
- Hospital Hottie
- Ill Girl: She's suffering from tuberculosis and becomes symptomatic in Season 2, requiring her to be put into isolation with visitors having to wear masks and gowns when in the same room with her.
- Mixed Ancestry: She's of Brazilian-American descent.
- Nerves of Steel: Being a natural Nice Girl and all, April proves she's invaluable in a crisis, in particular when she cheers up a terrified little girl with a cute story of her mother making treats and drugging an aggressive, intransigent patient with a sedative when he gets violent - all in one episode.
- Nice Girl
- Outliving One's Offspring: She suffers a miscarriage losing her unborn baby.
- Raised Catholic: She refuses to consider the idea of abortion when her TB symptoms and the medication could threaten her health.
- Relationship Upgrade: With Ethan at the end of Season 2.
- Transplant: Similar to Dr. Halstead, April was introduced in Chicago Fire Season 3 as an old high school friend of Kelly Severide.
- The Unfavorite: In her household, she is hinted to be this as her parents expected Noah, "the golden boy" to go to medical school.
Nurse Maggie Lockwood
The ED's Charge Nurse, responsible for triaging patients as they come into the ED. Nothing happens in the ED without her knowledge or permission.
- Big Sister Mentor: She treats nearly everyone in the ED as if they were her younger siblings. Especially evident in how she takes Sarah under her wing and helps the younger woman overcome a lot of her confidence issues.
- Black Best Friend: She's this for Natalie and April, since all three work closely in the E.D.
- A Friend in Need
- Heterosexual Life-Partners: With Natalie and April.
- Intergenerational Friendship: With Sharon Goodwin.
- No Good Deed Goes Unpunished
- Screw the Rules, I'm Doing What's Right!: In episode 14 of season 3, "Lock it Down", after a code pink puts the hospital in lockdown and short-staffed, Maggie treats a patient, a doctor's job, giving him a crike and she ends up saving his life. Though she is later suspended, the victims family doesn't want to sue the hospital out of gratitude.
- Sergeant Rock: She serves as the bridge between the nurses and doctors and mentors the staff who are still in training, even the ones who technically outrank her.
- Signed Language: In the Season 4 premiere, it's stated she's a certified in sign language.
- Trickster Mentor: She gives Dr. Choi just enough rope to hang himself as a way of showing him that his grand plans for the ED won't work.
Chief of Services at Gaffney Chicago Medical Center. A former nurse who made the switch to become an administrator.
- Beleaguered Bureaucrat: Not as frazzled as some examples but she has to walk a very fine line to make sure that patients receive the best care possible while also satisfying the hospital board and wealthy donors and also ensuring staff welfare.
- Beware the Nice Ones: As protective as she is of the hospital's staff, she angrily tells Dr. Halstead, after he goes against a patient's wishes, that she will fire him the moment she thinks that keeping him on will be to the hospital's detriment.
- Black Best Friend: For Dr. Charles as he's seen regularly mentioned having met her and her ex-husband Bert for drinks.
- Black Boss Lady: She's the chief of services at the hospital, runs the hospital with fairness and is a person of color.
- Happily Married: To Bert in Season 1. Subverted after the finale after he divorces her after she has no intentions of retiring from her job.
- Ill Girl: Reveals in the Season 2 finale she has diabetes.
- Intergenerational Friendship: With Maggie.
- A Mother to Her Men
- Not So Above It All
- O.O.C. Is Serious Business
Former Main Characters
Dr. Ava Bekkar
- All Girls Want Bad Boys: Ava lets Connor know in passing she "likes dangerous men."
- Ambiguous Disorder: The way she behaves after her and Connor's breakup implies Borderline Personality Disorder.
- Belligerent Sexual Tension: Has this in spades with Dr. Rhodes.
- Brutal Honesty
- Character Death (See Driven to Suicide)
- Driven to Suicide: When Dr. Latham mentions that the insulin that overdosed Dr. Rhode's father can be traced to who had access to it, she later uses a scalpel to slash her own throat. The last thing she says to Connor is that he really is an ungrateful prick. Further implying her guilt. Despite their attempts to save her, she dies on the operating table.
- Everyone Has Standards
- Hospital Hottie
- Jerkass: Very blunt, and has a rather underrated beside manner.
- Jerkass Has a Point
- Jerk with a Heart of Gold
- Manipulative Bitch
- No Social Skills
- Number Two: Bekkar joins Conner's role as a cardiothoracic surgery fellows working under Dr. Latham.
- Pet the Dog
- The Rival
- Worthy Opponent: She and Dr. Rhodes constantly compete over cases and clash over each other's different surgical judgements. Now and then they display a reluctant appreciation for each others' decisions, constantly switching between hot and cool.
- Yandere: After her breakup with Dr. Rhodes she is implied to be behind incidents which land Connor in trouble only to have her fix them, then it is implied she had intentionally overdosed Dr. Rhode's father with insulin resulting in his death, trying to win Connor back, when he rejects her, she calls him an ungrateful prick and tells him to rot in hell. Further implying she was indeed behind it all.
Dr. Connor Rhodes
A surgeon who originally joined Chicago Med for a trauma fellowship before transferring to a cardiothoracic fellowship. He's the scion of one of Chicago's most prominent families although he'd prefer to keep that fact a secret. Over the course of the first season, it's revealed that he was really hired to be the hand-picked successor of Dr. David Downey, a world-renowned transplant surgeon.
- Aloof Older Brother: To his sister Claire. Though he attempts to distance himself from his family because of his emotionally abusive father and his embarrassment over his family's status, he still cares for her.
- Blue Oni: To Halstead's Red Oni.
- Broken Ace: A gifted trauma and cardiothoracic surgeon but has trouble relating others early on and admits as much to fellow trauma surgeon Zanetti in season 1 "Malignant":Rhodes: "I have a father ... who you've met ... who's made it his life's mission to undermine me. And maybe that's made me a little sensitive at times."
Zanetti: "You have trust issues."
Rhodes: "You could put it that way."
- Chick Magnet
- Cloud Cuckoolanders Minder: When Dr. Latham tells Connor that he has Asperger's, Connor realizes just how momentous it is for Latham to have simply told him that and begins helping his new mentor better understand human interaction and smooths things over when Latham's behavior upsets others.
- Dark and Troubled Past: His mom committed suicide when he was ten, purportedly because of depression but an interaction between Connor and his dad implies he blames him for her death.
- Confides in Maggie that after he graduated high school, he bought drugs with a friend of his from an undercover cop and they were both arrested, but Connor's dad pulled strings and got Connor off while his pal was left to take the fall and committed suicide before Connor could make amends to which he still feels guilty.
- Defector from Decadence: He comes from an extremely wealthy upper-class family but chose to become a doctor because he wanted to do something meaningful with his life rather than join the family business to run high-end department stores.
- Establishing Character Moment: In the series' opening scene, seen on a passenger train, listening to music. Then the train suffers an accident. He immediately leaps into action, ignoring his own injury, inspecting everyone else's physical condition, and when he helps a patient to the hospital he persistently applies CPR even while standing on the gurney and then sets to work at the hospitla he just happened to be hired at.
- Expansion Pack Past: In the first episode alone, the audience learns that he grew up in a wealthy neighborhood, went to medical school in Mexico, and practiced medicine in Saudi Arabia.
- Love Makes You Stupid: In the season 2 finale, after Dr. Charles has Robyn forcibly admitted, Connor, ignoring the fact he's not a psychiatrist, hires lawyers to revoke the order to take Robyn out of the hospital and take care of her himself. Right afterwards, Robyn has a psychotic meltdown, she's brought back in on a stretcher and Charles rightfully pins her meltdown on him.
- Manly Tears: After his mentor and father figure, Dr. Downey passes away.
- Omniglot: Fluent in Spanish as he attended medical school at UAG in Mexico.
- Parental Issues: His mother committed suicide, and it's clear he holds his father accountable so much so he doesn't talk to his father at all.
- The Stoic: Generally very calm, collected and serious.
- Teeth-Clenched Teamwork: Though he doesn't get along with Will, they work well together and respect each other's medical opnions (while not necessarily appreciating them). Connor later stops Will from going near the latter's DNR patient after he' been ordered not to and thereby losing his medical license, saying that he considers Will a good doctor and the world needs good doctors.
- What the Hell, Hero?
Dr. Sarah Reese
A recently graduated medical student. She spent the first season wanting nothing more than to settle into a quiet career as a pathologist but finds herself reconsidering her career path after completing her rotation in emergency medicine. Unable to change her selected specialty, she spends the time skip between Season 1 and 2 working as a barista near the hospital before Dr. Charles offers her a residency in psychiatry.
- Adorkable: Naturally kind, humble and sometimes insecure, she comes across as this. Whilst she's taking to her new role as a psychiatrist resident, she takes to "shrinking" everyone she runs into on sight. Maggie and April find it hilarious.
- Boy Meets Girl: Her relationship with Joey, a lab tech at Chicago Med, begins with the two of them arguing about coffee etiquette on the hospital terrace and develops into a low-key relationship that gets occasionally touched upon and later ends fairly quietly.
- Break the Cutie: In Season 2, she tries her hardest to help a broken, vulnerable sex trafficking victim Danny escape his vicious situation. His captors only catch up to him and he turns up dead. Later along the way she must declare three patients dead in one night, that she accepts a psychotherapy course from Dr. Charles.
- Broken Ace
- Broken Pedestal
- Disappeared Dad
- The Intern: Becomes this to Dr. Charles, offering her a residency in psychiatry.
- Mommy Issues: Has a strained relationship with her mother.
- New Meat: As a young student doctor, she's absolutely overwhelmed by what goes on in the ED and has such severe confidence issues that she'll shrink back rather than step up in an emergency (her primary issue being finding veins with hypodermic needles). Maggie eventually takes Sarah under her wing and helps her gain a lot more confidence in the latter half of the first season.
- Non-Idle Rich: Her mother is wealthy enough to send checks with many zeroes as an "apology" for not coming to dinner. She prefers supporting herself and not depending on family money, even working as a barista to make ends meet.
- Quirky Curls: Her hair is usually rather unkempt and frizzy. The effect is doubled if she wears it in a top-knot.
- Reality Ensues: She tries to change her chosen specialty after receiving an offer to train to be a pathologist. Because this is a breach of contract, she ends up losing her place at Chicago Med and is working as a barista until Dr. Charles offers to personally train her to become a psychiatrist.
- The Paranoiac: She's becomes ridden anxious after Dr. Charles gets shot by a former patient and paranoid over potential threats patients pose their doctors especially after she's conned by a sociopathic pickpocket, her tires are slashed and Noah is assaulted by a grieving brother. She finally cracks when she buys pepper spray and to her horror sprays a patient, resulting in her being suspended.
- Parental Issues
- Put on a Bus
- What the Hell, Hero?: As a sign that she's becoming more confident as a doctor and willing to fight for her patients, she goes on a furious rant against Dr. Charles for going behind her back and reversing her orders, justifiably saying that he ended up destroying her doctor-patient relationship with Robyn because he acted in haste.
Gaffney Chicago Medical Center staff
Dr. Samuel "Sam" Abrams
An attending neurosurgeon who is known for his blunt and pessimistic behavior.
A lab tech in pathology who dates Sarah Reese.
Dr. Noah Sexton
Abby Sexton's younger brother and going through his residency at Chicago Med. He has a tendency to get himself into trouble and is a constant source of worry for his sister.
- Brilliant, but Lazy
- Character Development
- Foolish Sibling, Responsible Sibling
- Jerk with a Heart of Gold
- Shameless Self-Promoter: In his debut appearance, he took to delivering lab results on a patient to Dr. Choi and taking credit for them so to earn Choi's favor, to Reese's ire. Though he does apologizes later, he asks her not to tell his sister.
- Spoiled Brat: Is implied via a conversation between April and Liuetenant Kelly Severide that Noah was the golden boy of the family, the one who got to medical school despite April being the more academic and hard-working of the two. His irresponsible behavior only attributes to this.
- Tough Love: In Season 2, "Deliver Us" he tries to garner assistance from Ethan and then April to solve a case as the admission to earning a med spot at Med, they both sharply rebuke him that he cannot have others carry his water for them, prompting him to solve the case. It pays off.
Dr. David Downey
Formerly a firefighter with Chicago Fire Department, he found himself having to retire on disability due to a back injury. Not content with sitting at home, he went back to school and is now an intern at Chicago Med's ED. He and Natalie Manning's husband (also named Jeff) were good friends and they served together in the Middle East. He and Natalie begin to pursue a relationship in Season 2.
- Birds of a Feather: Works together multiple times with Dr. Choi, no doubt due in part to their military background.
- The Bus Came Back: He had a brief run on Chicago Fire but proved to be so popular that the producers brought him back on Med, giving him a career change in the process.
- Career-Ending Injury: He badly injured his back, ending his career as a firefighter.
- One Steve Limit: His best friend, Natalie's deceased husband, was also named "Jeff", and they were collectively known as "The Two Jeffs".
- Put on a Bus: Jeff gets matched at a hospital in Honolulu, Hawaii after completing medical school.
Dr. Nina Shore
Chicago Med's pathologist. She finds investigating all the strange and unusual ways people die to be a fun and exciting profession while most of the hospital staff find her to be a little odd. She begins a relationship with Will Halstead in Season 2.
- Really Gets Around: She cheerfully rattles off a very long list of hospital staff she dated prior to Will.
Dr. Isidore Latham
A cardio-thoracic surgeon who takes over Connor Rhodes' training in Season 2. He is a brilliant surgeon but has difficulty interacting with others.
- Ambiguous Disorder: He finds human interaction difficult and will throw tantrums if his routine is disrupted too much. He eventually begins speaking with Dr. Charles and is formally diagnosed with Asperger's Syndrome and undergoes a series of electro-stimulation therapies to his brain in an attempt to better perceive human interaction.
- Bunny-Ears Lawyer: He admits to having difficulty interacting with others but his skills as a surgeon are second to none and his hearing is so refined that he can diagnose a faulty heart valve just by listening through his stethoscope whereas other doctors would need more high-tech diagnostic equipment.
- Hair-Trigger Temper: He's shown a tendency to loudly snap at people if they don't immediately do as he says when in the OR. This is eventually revealed to be a sign that he has Asperger's Syndrome that had heretofore been undiagnosed.
- Hidden Depths: To Connor's surprise, Dr. Latham is a gifted piano player who plays in a quartet with other Chicago Med staff. And despite seeming to be very by-the-book, Latham is, according to Natalie Manning, a skilled improvisor with an ability to take what he plays into entirely unexpected directions.
- Serious Business: He is a highly-devout Orthodox Jew who wears tzitzit and a kippah at all times. He will come into the office on the Sabbath if it's his turn on the rotation but he will sit in his office and refrain from doing any of the prohibited activities but get up to operate if a patient's life is at risk.