Phillip Wen (Charles Chun)
- Deadpan Snarker: It's not his default mode, but he occasionally slips in snarky comments in a very dry tone that doesn't call much attention to it. For example, when Turk goes to apologize to Dr. Wen after making a comment accusing Dr. Wen of favoring another intern because the intern is also Asian-American:Turk: Dr. Wen, I just want to take this opportunity to once again apologize to you and the entire Asian community.
Dr. Wen: I'll pass it on at the next big meeting.
- Don't Think, Feel: Well, maybe not "don't think" entirely, but he does warn Turk against overthinking during surgery. Surgery depends on physical skills after all, so thinking too much or hesitating in a critical moment can result in bad things happening.
- Foil: He poses an interesting one for Dr. Cox. Both are mentors to younger doctors and interns, both defy certain stereotypes of their positions, and both pay a role in developing the careers of the main characters, albeit in very different ways. Dr. Wen is an authority figure in the surgical section, who are stereotyped as Hot-Blooded "jocks" of the hospital, but Dr. Wen himself is a calm, even tempered man who encourages younger surgeons to grow beyond that stereotype. Dr. Cox meanwhile is a longtime doctor for Internal Medicine, who are stereotyped as the nerdy and neurotic section of the hospital, but is an athletic, hot tempered, rebellious figure who is reluctant to become the mentor for the interns.
- Happily Married: He's mentioned to be married and was involved in a car accident with his wife briefly.
- Mentor Archetype: He's a more straightforward one for Turk than Dr. Cox is for J.D.
- Not So Above It All: While he's mostly a Straight Man and a Reasonable Authority Figure, at the end of one episode there was a race between Internal Medicine and the Surgeons, (doctors Cox and Wen are each sitting in a wheelchair, while they're pushed by J.D. and Turk respectively) and Dr. Wen is just as into it as anybody. In fact, he might be the most hyped person there and the most competitive to win the race.
- Only Sane Man: Firmly believes that surgeons don't need to be shallow rank obsessed cliches and has a no-nonsense approach with his interns and doesn't approve of goofing off or large egos while on the job.
- Put on a Bus: He disappeared physically shortly after giving Turk his attending surgeon position, supposedly for family reasons. He was mentioned a bit in Season 6, but he never appeared again. He still appeared in J.D.'s final fantasy in My Finale.
- Reasonable Authority Figure: He doesn't abuse his power and he compliments the interns/residents when they do well. He also gives Turk an attending surgeon position because he was providing excellent patient care beyond the bare minimum.
- Straight Man: Even more than Carla. He's pretty much the only normal person of all the people who worked at Sacred Heart Hospital throughout the show.
Lonnie (Michael Hobert)
- Back for the Finale: Appears in J.D.'s last fantasy in My Finale to say he hates him.
- Butt-Monkey: Both J.D. and Dr. Cox have taken advantage of their power over him on several occasions, with Dr. Cox even once mummifying his head.
- Jerkass: He's as much of an ass to J.D. as he can be and get away with it.
- Put on a Bus: Vanished after Season 5 outside of a small cameo in Season 6.
- Really Gets Around: He has three children that he knows about and probably has more.
Molly Clock (Heather Graham)
A Bunny-Ears Lawyer psychiatrist who temporarily worked at Sacred Heart Hospital.
- The Ace: A brilliant shrink who could not only heal The Todd, make any character realize their problems, but her everlasting good mood couldn't be crushed by Dr. Kelso and Dr. Cox combined either.
- All Girls Want Bad Boys: Sort of. She tells JD that she is attracted to damaged, dysfunctional people.J.D.: Molly, I'm narcissistic, I'm pessimistic, I'm obsessive, I'm insecure. And I am so afraid of intimacy that every one of my relationships is a journey of self-sabotage that inevitably ends in a black vacuum of shattered expectations and despair.Molly: Wow. (she kisses him passionately)
- Bunny-Ears Lawyer: Acts like a total airhead, yet she is a very skilled psychiatrist.
- Cloudcuckoolander: Very much so.Molly: So, where were we?J.D.: Uhh, we weren't talking.Molly: Was it cause of something you did? Cause I'm totally over it, I don't even remember what it was.J.D.: No, I mean like, we've never talked. Ever.Molly: Well how do I know your name then?J.D.: You don't.
- There is a running gag that never gets commented on in series- Molly never has a clue what time it is.
- Ditzy Genius: Extremely perceptive and a brilliant psychiatrist, but also very ditzy and spacey (even more than JD or Elliot). Shes not nearly as naïve as she seems and is able to manipulate both Dr. Kelso and Dr. Cox.
- Does Not Like Shoes: Is almost exclusively seen wearing flipflops when wearing shoes at all.
- Everyone Loves Blondes: Blonde and attracts most of the hospital.Turk: It's not just sex. It's sex with Molly! Any guy would kill to have sex with Molly.
- Good Is Not Dumb: Molly's indomitable optimism stands against the cynicism of Dr. Cox and Dr. Kelso, and she's still able to triumph against them.
- Hospital Hottie: The hospital's second hottest employee of the female staff members, according to JD and Turk.
- Nice Girl: Yes, shes very nice to everyone, but far from a pushover.
- Put on a Bus: She's introduced in early season 4 and is Put on a Bus after a few episodes. The Bus Came Back for one episode later in the season.
- Romantic Two-Girl Friendship: A short-lived one with Elliot.
- Shout-Out: Her name is a reference to Dr. Dolly Klock, who was the medical consultant for the show's pilot episode.
- Team Mom: Proves to be a better one than Carla, which makes Carla temporarily jealous when all her friends start confiding their problems to Molly.
- Wide-Eyed Idealist: She believes in the best in everybody, and that nobody is truly bad. She succeeds in proving her point to Dr. Cox. and Kelso (despite them claiming the opposite) and finding the Hidden Heart of Gold in both of them.
Kim Briggs (Elizabeth Banks)
A surgeon at Sacred Heart. She and J.D. become romantically involved in season 5, but she becomes pregnant on their second date, causing their relationship to become infinitely more complicated. Soon after, she moves away for work and claims to have a miscarriage, but she actually did not and naturally, J.D. eventually finds out. Though they do not end up together, J.D. and Kim do ultimately manage to amiably co-parent their son, Sam.
- Ambition Is Evil: J.D. finds out that Kim passed on performing a risky surgery to keep her stats up and gives her a Reason You Suck speech; Kim "learns a lesson" from this and does the surgery, even though the other doctors (including Doctor Cox) treat her passing on it as a fairly reasonable thing to do considering the demands of her job. Incidentally, this might be the only time in the entire series where she appears to consider J.D.'s opinions about something to be of similar importance to her own.
- Backstory Invader: Parodied. She's introduced in the tail-end of season 5, but the characters claim she's been there all along. It turns out that J.D. genuinely doesn't notice women who wear wedding rings.
- Bitch in Sheep's Clothing: Either her pregnancy hormones made her completely crazy, or she's really not a very nice person.
- But I Can't Be Pregnant!: She and J.D. opt not to have sex because they don't have a condom and don't want to risk a pregnancy. Unfortunately, it's still possible (although unlikely) to get pregnant without performing full intercourse. When J.D. asks if she's sure she's pregnant, she produces about 12 positive pregnancy tests.
- Convenient Miscarriage: She attempts to pull this in order to break up with J.D. after moving away for work - it would have probably worked better if she'd actually miscarried, though.
- Everyone Loves Blondes: She is blonde and her debut episode reveals that "she gets along with everybody" and "all the guys like her".
- Good Girls Avoid Abortion: Played Straight - though they discuss the option, J.D. and Kim decide not to abort.
- Hospital Hottie: Everyone in the hospital likes her, she has no issue with casually sharing details of her past sex life with patients, and J.D. is smitten with her as soon as he first notices her.
- Insane Troll Logic: She admits that she resents that J.D. broke up with her after her faked miscarriage because she wanted him to want to be with her in spite of it... even though she recognizes that she wouldn't have wanted to stay together with him without the baby either.
- Motor Mouth: She and Elliot bond over both being this.
- Never My Fault: She moves away for work even though J.D. wanted her to stay, then lies to J.D. about miscarrying their child. The only reason he even found out she was still pregnant was because he ran into her at a medical conference while she was showing. After J.D. tells her that he doesn't think he can ever fully forgive her for this or consider getting together with her romantically again, she breaks down crying because obviously her pregnancy has made her too fat for him to be attracted to her now. Never mind the perfectly reasonable reasons he has to not want to be with her...
- Pair the Spares: Kim ends up with Sean, Elliot's ex and J.D.'s 'nemesis.' Elliot introduced them.
- Romantic False Lead: For J.D.
- The Unfair Sex: She tells J.D. she loves him for the first time while in labor, and insists he immediately tell her whether or not he loves her too; when he tries to gently explain he doesn't but hopes to eventually, she flips out and dumps him. Everyone else treats this as though J.D. has done something truly horrible - even though Kim basically begged J.D. to get back together with her in the first place when he was reluctant to after she lied to him about miscarrying.
- Wedding Ring Defense: Kim continued wearing her wedding ring after her divorce to keep people from hitting on her.
Katie Collins (Betsy Beutler)
An intern introduced in Season 8, she's a notorious kiss ass out for herself trying to get ahead of everyone else.
- Bitch in Sheep's Clothing: She puts on a good show of politeness and amiability, but she is a notorious kiss-ass who will manipulate and screw over everyone in her way to get ahead and takes credit for things she didn't do.
- Break the Haughty: Carla inflicts one of these on her after she catches Katie taking credit for doing a medical procedure she didn't do and warns her that everyone's aware how she's out for herself and no one cares about her past and if she lets them, the hospital staff will take care of her. It works.
- It's All About Me: She is incredibly selfish and out for herself and will walk over anyone to get what she wants.
- Manipulative Bitch: She used Elliot to get Turk to give her an research opportunity and then took credit for a medical procedure that another intern did. Carla quickly discouraged this as soon as she saw it.
Sonja "Sunny" Dey (Sonal Shah)
One of the interns introduced in Season 8, she is incredibly happy and has a sunny disposition at all times.
- Genki Girl: She has a very bubbly personality.
- Hidden Depths: She admits to the Janitor that it can sometimes be hard to be so friendly and happy all the time. She also admits that her father is an ass, so she's not incapable of negative thoughts.
- Meaningful Name: Sunny Day.
- Nice Girl: She is incredibly nice and friendly to everyone, but she's aware of her fellow intern's flaws, she just overlooks them.
- Perpetual Smiler: The Janitor even called her "Smiley Intern".
- Tomboy and Girly Girl: The cheerful and friendly Girly Girl to her "best friend", the rude, cynical The Lad-ette Denise.
- Wide-Eyed Idealist: Insanely idealistic, mostly shown in My Absence where she tries to keep a coma patient alive long enough for the patient's sister to say goodbye despite Dr. Cox's refusal to help and Carla's not helping. either
Ed Dhandapani (Aziz Ansari)
An intern introduced in Season 8, he is notoriously lazy and ends up fired when Dr. Cox is Chief of Medicine because of this after being given a second chance.
- Brilliant, but Lazy: He was doing much better then most interns at first despite his laziness, but it's immediately deconstructed after it's proven that he's not willing to improve when he has to. Meanwhile the other interns begin honing their skills by being diligent and caring about the job, which eventually leaves Ed the lowest performing one of the group. When Cox gives him an ultimatum about focusing on his work and he still refuses to do so, he promptly gets fired.
- Put on a Bus: He was fired after Dr. Cox finally gave up on him. This was because his actor got a permanent position on Parks and Recreation.
- The Slacker: He's the most lazy intern ever and instead of doing all the stuff that interns have to do so they can grow as doctors, he'd rather slack off and go get pizza.
- The Stoner: Rumored to be, but it's never confirmed.
- You Are the New Trend: He starts so many new trends in his short time at the hospital.
Hooch (Phil Lewis)
A surgeon who Turk and JD love to mess with. He has a very short fuse.
- Ax-Crazy: Hooch is crazy.
- Back for the Finale: In JD's last fantasy in the Season 8 finale.
- Beware the Nice Ones: He seems quite cheerful and friendly at first, but it quickly becomes apparent that he's deeply unstable.
- Butt-Monkey: A favorite of Turk and JD's. His status as one is what drives him crazy
- Disproportionate Retribution: After being caught by a prank involving bouillon cubes put in the shower-head, his response is to threaten to run the perpetrator over in his S.U.V. Some interns following Hooch around for a day led to a hostage situation.Hooch: [while holding a lighter with a humongous flame] Burn for a burn, baby! That's in the Bible.
- Hair-Trigger Temper: There's a reason people say he's crazy.
- Phrase Catcher: Said fondly/in amusement: "Hooch is crazy."
Grace Miller (Bellamy Young)
An attending introduced in Season 3. She's an incredibly condescending Jerkass and sees any attempt to defend her from men as sexism. She was written out of the show at the end of Season 3.
- Distaff Counterpart: To Dr. Cox. She didn't last long because the writers realized that they had already a female version of Dr. Cox in Jordan.
- Everyone Loves Blondes: In a fantasy, the surgeons imagine her as Marilyn Monroe.
- Hospital Hottie: How she is seen by the male surgeons, including Turk. Dr. Cox. and Dr. Kelso were attracted to her too.
- Insane Troll Logic: Turk standing up for her because Todd was being sexist automatically means he's sexist too and Turk has to apologize. And Elliot being friends with Turk means she's sexist by association and not a real feminist.
- Jerkass: She puts Jordan to shame. Jordan is at least amusing with her condescension and insults and had visible redeeming qualities. Dr. Miller is just a bitch (the closest she gets to a redeeming moment is letting Turk leave a surgery that's taking longer than expected to go to his own wedding!).
- Put on a Bus: At the end of season 3.
Dan Dorian (Tom Cavanagh)
J.D.'s less successful older brother. Usually shows up Once a Season and mooches off of his brother.
- Alliterative Name: Dan Dorian.
- Big Brother Bully: He's still bullying JD even as an adult.
- Broken Pedestal: At some point JD started seeing him as a loser.Dan: (solemn) "Look. My brother will never look up to me. But he hangs on your [Cox's] word."
- Dark Horse Sibling: Goes from a feckless mooch to a successful real estate agent in Season 7, leaving J.D. jealous that he's no longer the best-off of them.
- Disappointing Older Sibling: Dan was a cool guy in high school but became an underpaid bartender and attic dweller while J.D. went on to become a doctor.
- Foolish Sibling, Responsible Sibling: The Foolish to J.D.'s Responsible.
- Hypocritical Humor: When Turk asks (in front of JD!) if Dan really slept with Elliot:Dan: A friend wouldn't ask and a gentleman wouldn't tell.
Turk: So, did you?
Dan: (smugly) Twice.
- Jerkass: Dan has always been a jackass to J.D., sleeping with his college girlfriend, sleeping with Elliot, constantly bullying J.D. as they grew up and whenever Dan showed up, he mooched off of J.D., constantly annoyed him and gave him all kinds of hell for no reason other then For the Lulz.
- Jerk with a Heart of Gold: More like a "Jerk With a Tiny Heart of Bronze". He made it clear that Dr. Cox took being J.D.'s mentor more seriously out of concern that J.D. would become a cynical jackass who hated his job (Season 3), comforted J.D. when their dad died (Season 4) and bought J.D. a new car. (Season 7)
- Manchild: So immature and irresponsible that J.D. is actually the more serious brother. Despite J.D's goofy personality, he's very good at his job and and can look after himself, unlike his brother.
- Rags to Riches: He eventually makes a profitable career as a real estate agent, much to J.D.'s initial chagrin, since he was the one used to be the successful brother.
- Straw Loser: J.D. is glad that his loser brother Dan makes him look successful in comparison to him. Averted in season 7 where Dan becomes a successful real estate agent, making J.D. very jealous.
- What the Hell, Hero?: He wasn't happy that J.D. told him that he's meant to be the loser of the family.
Ladinia "Lady" Williams/ Matthews (Kit Pongetti)
The Janitor's oddly named girlfriend, first appearing in Season 7. Marries the Janitor in Season 8.
- All There in the Manual: Her real first and last name
- Satellite Love Interest: Doesn't really get much in characterization beyond her romance with the Janitor
- Terrified of Germs: She's a hand specific germaphobe, a fact her therapist believes was a contributing factor in her falling for the Janitor. That and he's a dead ringer for her dad
- Who Names Their Kid "Dude"?: Basically the punchline of her name. She has a brother named Him.
Jason "Cabbage" Cabbagio (Shaughn Buchholz)
A spectacularly incompetent intern, who first appears in Season 5 and is quickly fired. He later pops up again as one of the baristas at the hospital's Coffee Bucks.
- The Bus Came Back: After getting fired in Season 5, he returns in Season 6 working at Coffee Bucks, and makes several more appearances during the course of that season.
- Epic Fail: Easily takes the cake as the most incompetent medical professional seen in the show's entire run. He doesn't have any hidden talents like Doug, isn't suffering from outdated knowledge like Dr. Townshend, and isn't an otherwise-competent doctor who lets his attitude get in the way like Cole; he simply has zero talent for medicine, something further illustrated when he has to resort to working as a barista to make a living.
- Expy: Subverted. Initially J.D. takes Cabbage to be much like his own younger self, and resolves to have a better relationship with him than he himself does with Dr. Cox. As Cox himself later points out, however, Cabbage is actually his opposite; whereas J.D. is a goofball whose relationship with his mentor is complicated at best, but ultimately a good doctor, Cabbage is much more earnest and affable and has a good relationship with J.D., but is dangerously incompetent and has absolutely no business trying to become a medical professional. If anything, he's actually an even more incompetent version of Doug.
- Meaningful Name: Not so much at first, but eventually J.D. has to admit that an actual cabbage would probably make a better doctor than him.
- Nice Guy: Despite his faults, Cabbage is ultimately a really friendly and kind person. While he ended up giving Mrs Wilk a deadly infection, it happened because he wanted to see her one last time before leaving the hospital.
- Small Role, Big Impact: At least, when we're talking about his tenure as an intern. He got fired after four episodes, but not before he transmits an ultimately lethal infection to Mrs. Wilk, a recurring patient, via his improper handling of medical waste.note
Danni Sullivan (Tara Reid)
Jordan's sister who briefly dated J.D. in season 3.
- Distaff Counterpart: Strangely enough, she's introduced as this to J.D. in her first episode.
- Jerkass Has a Point: She points out to J.D. that his obsession with Elliot was just because he always wants the things he can't have. And she was perfectly right.
- The Lad-ette: She likes beer, smoking, rough sex...
- Really Gets Around: She was cheating on J.D. during their rebound relationship, and at Turk's wedding she made out with both Doug and Ted.
- Took a Level in Jerkass: She seems like a relatively decent person in her early appearances, but becomes more and more bitchy and slutty, especially after her first break up with J.D. In her last appearance ("My Quarantine" in season 4), she's completely obnoxious.
A little person who becomes part of the janitorial staff at Sacred Heart.
- The Ace: He's apparently very skilled in martial arts, strong enough to beat the much larger janitor in at least one wrestling match, was voted head of the janitors union despite being new to the job, and sings very good acapella.
- Back for the Finale: Appears as a cameo in J.D's exit scene in the original series finale.
- Chuck Cunningham Syndrome: Disappears without a mention after season 4.
- Groin Attack: Has a habit of saying "that's a real punch in the crotch!" when referring to a piece of badluck, leading to him doing this in J.D's fantasies.
- Noodle Incident: Apparently the Janitor once saved him from an eagle.
- Pintsized Powerhouse: Stands roughly 3 feet tall and was apparently able to beat the Big Guy janitor in multiple wrestling matches, as well as easily break his hand in a handshake turned game of mercy.
- What Happened to the Mouse??: Appears as a recurring character on season 3 and 4,but eventually disappears afterwards with no explanation, despite his friendship with The Janitor and position in staff.
Bonnie Chang/Lee (Lela Lee)
A surgical intern who started working at Sacred Heart at the same time as Turk, J.D., and Elliot. She quickly formed an intense rivalry with Turk.
- Always Someone Better: For awhile Turk is frustrated that she always seems to be doing a little better than him at everything, and is chosen by Dr. Wen for plum assignments. Turks imagines himself competing against her to be the best... until Dr. Wen tells Turk that he doesn't think either of them is the best of the surgical interns.
- Bitch in Sheep's Clothing: And she only bothers wearing the sheep's clothing for higher ranking doctors. She's perfectly fine with being obnoxious to anyone else, especially rival surgeons, but plays nice and kisses butt for her superiors. For example, after being chosen to assist Dr. Wen in one procedure, she politely thanks him, and when Dr. Wen has his back turned, tells Turk to kiss her ass because she was chosen instead of him.
- Foe Yay: During a moment of insecurity Carla briefly fears that she and Turk have a case of this In-Universe. However it's firmly averted, Turk and Bonnie are shown to dislike each other pretty intensely and have no interest in each other.
- Jerkass: Competitive, rude, and obnoxious. Put her in a position of power and she'll add condescending to the mix too, as she does when Turk is forced to act as her assistant during a surgical procedure.
- Jerk with a Heart of Jerk: When Turk tries to bury the hatchet with her and offers to give her the spot for the Doctors Without Borders trip, it briefly seems like she's considering what he says, but she almost immediately throws it back in his face and continues (rather childishly) her rivalry with him instead.
- The Napoleon: She's quite petite, and is often aggressive, especially to the much taller Turk, who often has to bend over to look her in the eyes.
- Only One Name: She's only ever referred to as Bonnie. At one point the board with different surgical assignments puts her last name as Lee, (the actual surname of the actress playing her) but in another episode it seems to indicate her last name is Chang instead. The show's wiki has decided to list her as Bonnie Chang.
- Rejected Apology: Turk tries to make peace with her and offers her Doctors Without Borders trip that she should have gotten instead of him. She tells him off and continues their rivalry instead.
- The Rival: Turk's rival in the surgical department. Her disappearance after Turk makes one last attempt to normalize relations with her is probably a sign that Turk decided to take Dr. Wen's advice, stop putting so much importance on competing with her, and move on with his own life and career instead.
- What Happened to the Mouse?: She's never seen again after the early Season 2 episode which pretty effectively shows that she has no interest ending her rivalry and competition with Turk.