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Main Character Index | Main Characters | BoJack Horseman (A-D, E-K, L-Z) | Princess Carolyn | Diane Nguyen | Mr. Peanutbutter | Todd Chávez | Hollywoo Residents and Other Stars | L.A. Residents | Stilton Family and Associates | MBN | Horsin Around Cast And Crew | Sarah Lynn | Secretariat Biopic Cast And Crew | Vigor | VIM Agency | Gekko-Rabbinowitz Agencies | One Shot and Bit Characters | The Main Group Family Members | The Horseman Family | Hollyhock | Beatrice Sugarman-Horseman |Butterscotch Horseman | Other Characters | Tesuque, New Mexico | The Moore-Carsons | Charlotte Moore-Carson | Historical Characters | "Horsin' Around" Characters | "Mr. Peanutbutter's House" Characters | "Secretariat" Biopic Characters
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Beware of rampant spoilers of season 1 and 2! While the majority of spoilers involving plot points of the current season will be hidden, this is not consistent depending on the situation, with just the presence of certain tropes being spoilers. Enter the folders at your OWN RISK.

This article is for Netflix's first original animated series Bojack Horseman's character.


https://static.tvtropes.org/pmwiki/pub/images/diane1_4.png

Bibliography:
  • Zippo Pine Bar, Secretariat: A Biography, One Trick Pony, Scrapped Biography about Sebastian St. Claire.

Portfolio:
  • One time Mc Sweeney's article writer, professional ghostwriter, social media manager for celebrities, writer for Girl Croosh.

Played By: Alison Brie

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"Dear Diane. We are sorry to say that your piece, 'An Open Letter to Open Letters', wasn't right for us, despite its evident merit." Do you know what this means? [...] Someone gave my piece a read and decided against it.

Hailing from Boston, Diane Nguyen has always wished to stand out from the crowd and become a world-changing force of nature either through writing, charity or seeking out against the injustices the everyman suffers. There's a large obstacle, though: She loathes being thrown into the spotlight and prefers to blend in the environment without really calling attention to herself. Moving to Hollywoo in order to write about real-life important figures, she realizes the cold truth: even removing her shyness, nobody wants to hear what she has to say. Retreading to part time jobs like being a barista at Starbucks or catering to large events like the John Edwards campaign, Diane's days are spent talking with Roxy, one of her best friends and Wayne, her soon-to-be ex-boyfriend, and trying to get some of her work published in media like The New Yorker or, for lack of a better option, McSweeney's....

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....at least, until she meets a friendly Labrador named Mr. Peanutbutter, former star of "Mr. Peanutbutter's House" during an awkward meeting in the coffeeshop. After another encounter in a public meeting, they begin dating and before long, move in together. During this period, Diane manages to find some success in the publishing of her non-fiction novel about one of Hollywoo's major tragic figures, Secretariat, earning her some long overdue recognition. This calls Penguin Publishing's attention, especially Pinky Penguin, and hires her as a ghostwriter for a tentative biography about a BoJack Horseman, star from The '90s hit sitcom, "Horsin' Around", which could be her next big break.

Starting rather aloof of each other, Diane becomes impatient with BoJack's lack of cooperation and evasion of any personal questions. SHE'S TRYING TO WRITE THE TRUTH, GODDAMMIT! So in order to get some work done, she uses a marvelous old invention: lying. During this time, she receives a visit from Wayne, as he becomes a writer for Mr. Peanutbutter for an article of Buzzfeed, in which she finds out he's using him as a prop joke for the article. As they call each other, she becomes concerned that she might do the same to her subject with the biography. As the creative juices start flowing the curmudgeon starts opening up, Diane is confronted with ghosts from the past: her family asking her to return for their father's funeral to plan and finance it all by herself. As the lies she's told BoJack about her home life crumble, Diane's confronted with the toxic relationship she carries with her family and she and the horse finally reach understanding by both having had shitty childhoods. Upon their return to Hollywood, Diane starts having second thoughts about her relationship with Mr. Peanutbutter; hindered by her love for him and fear of dying alone, all while remaining ambivalent and coy about her true feelings for BoJack. Once Mr. Peanutbutter's GRAND proposal comes along, however, she decides to accept, with her relationship with BoJack put on hold especially after he kisses her after a disastrous visit to Herb Kazzaz's house, a former comedy partner of his.

After the biography is finally complete, Diane's friendship with the horse ends up strained even more as the fear becomes truth: Diane put everything in paper regardless of tact or intimacy. She also didn't resort to skimper details of how BoJack really is, even sometimes forgetting to measure the words used. She also abandons the "ghostwritten autobiography" format and writes it entirely from her own perspective as an interviewer. Making matters worse, Diane released against BoJack's back a sneak peek chapter in Buzzfeed. This briefly makes their friendship collapses and leads to her firing as his biographer. Once they sort out their differences and Diane's version is approved by BoJack, they resume being supportive of each other, even if their conflicted feelings over each other remain unsolved.

Pretty low-key person, quiet and awkward at social gatherings, yet bold and ironically upstanding when she feels it's necessary, Diane constantly tries to achieve some notoriety, only to fall flat by three factors: her stubborn belief that her way of doing things is the only correct way (even when she's no longer involved), her refusal to be pragmatic or compromise her position at all, and her flip-flop morality when it comes to doing the right thing. In the end, both her bright-eyed willingness to help broken people and her self-centered expectations for the same share a common core: her deep desire for goodness without compromise. In other words, a true crusader.


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    A-C 
  • About the Author: In-Universe example. As BoJack observes while holding the book in "Later", a quick look at the back cover of the Secretariat biography shows a mini-bio of Diane and praise for her writing style coming from "The New Yorkie Times", "USA Toady", and "Newsbeak".
  • Absence Makes the Heart Go Yonder: Diane works hard to convince Mr. Peanutbutter that's not gonna be the case between her and Sebastian St. Claire since he doesn't want to lose her in any way and that's why he been trying to convince her not to go. It's later sadly played straight when her trip to Cordovia and subsequent disillusionment with everything, as well as her lying to Mr. Peanutbutter about where she was leads to a growing rift between them that only keeps widening the more time goes by. As of season 4, their marriage has finally crumbled.
  • Absentee Actor: In-Universe examples:
    • Diane is notably absent from the Christmas Episode.
    • Season 1: Diane appears in all episodes, although this trope arguably comes into play in "Say Anything", since while Diane appears at the end, she has no dialogue.
    • Season 2: While still a major character, Diane misses "Still Broken", "Let's Find Out"note  and again, arguably "Escape From L.A." since she only appears at the end. She does get some lines this time around, though.
    • Season 3: Absent from "Fish Out Of Water" (so is the rest of the cast except BoJack) and "Best Thing That Ever Happened".
  • Abusive Parents: Especially her father, which is why she manages to find common ground with BoJack. See Dark and Troubled Past below.
  • Acquired Situational Narcissism: One of her biggest flaws. Whenever Diane thinks she stands on higher ground compared to other's actions or beliefs, she will let people know it in the most condescending, preachy way possible even if she has a valid reason for doing so. It usually takes her a few minutes, hours at worst to be knocked down from her pedestal and see things from other people's perspectives, although she can recognize whenever she has been overly judgmental, even if she still has problems thinking before acting over it.
  • Action Survivor: The best way to describe Diane's experiences in Cordovia. Ducking and just being lucky to stay away do wonders for your survival in a war-riddled country. The same can't be said for the emotional impact.
  • A-Cup Angst: Implied in "Yes And". An emotional wreck at the time, she discovers a Cheeto in her bust, happy it's there when she was looking for food. Her comments about "knowing she kept them [her boobs] for a reason" doesn't exactly suggest a high opinion of her cup size.
  • Adaptational Angst Upgrade: A documentary about Mr. Peanutbutter getting married to Diane with BoJack as a minor character gets derailed into making Mr. Peanutbutter a Flat Character that spews a single catchphrase of dialogue over and over, BoJack gets a bigger dose of Adaptational Villainy and Diane ends devolving into a troubled woman who ends up using most of her screen time to give long speeches about her numerous mental illnesses.
  • Adaptational Attractiveness: While not plain and quite beautiful on her own, Diane's not exactly attractive in an astonishing way. In Mr. Peanutbutter's Hollywoo Heist, she's played by Naomi Watts.
  • Adaptational Personality Change: In the adaptation of "Mr. Peanutbutter's Hollywoo Heist", Diane's character goes from a reasonable woman to a deranged, mentally-ill person who claims to be Hearing Voices and rambles about her mental issues.
  • Adaptational Species Change: Once the adaptation of "Mr. Peanutbutter's Hollywoo Heist" continues going downhill, Diane's origin is changed into that of an alien form whose real body is that of an all-knowing floating orb of light.
  • Adapted Out: Eventually, Diane as a character is written out of the movie "Mr. Peanutbutter's Hollywoo Heist" and replaced by a ball on a stick.
  • Adjusting Your Glasses: She often does this, in the same form one straightens up his tie, usually when she's about to get serious and is thinking deeply how to get her point across or when she's exasperated.
  • Adorkable: Shy and helpful demeanor, Asian and Nerdy, good-looking and well-intentioned but firm in her ideals, constantly blushes when she receives any kind of appreciation and high empathy towards people? Yep, she fits this to a T. It's not as often as it's normally portrayed, but every once in a while, Diane can switch from being a serious woman one moment and the next an incorregible dorky girl with a superior teenager attitude.
    • There's her know-it-all attitude and the flustered embarrassed expressions when she's proved wrong or assumes something a priori.
    • "The BoJack Horseman Story: Chapter One": Her first meeting with BoJack pretty much sets the bar, with Diane approaching him in the decks and trying to talk with him, only to fail to get him to understand what she's talking about, speaking out loud about her own issues and stumbling on her own words.
    • "Chickens": Diane spends the day with Kelsey's daughter Irving and tries to bond with her through any means possible. Once Irving addresses her as her "cool friend" along with Todd in the police station, Diane responds with delight:
    What? Cool? I mean, that's cool that you think I'm cool. I don't care or anything, but, you know, it's cool.
    • "The Shot": Her constant interactions with Kinko and caring for him such as reading him The New Yorker as a bedtime story. The Food Critics section, specifically.
      Kinko: When I grow up, I can be food critic for New Yorker?
      Diane: You can do anything you want in life. Not everyone can write for The New Yorker, but there's always The Atlantic.
    • "BoJack Kills": Whenever she's with BoJack, expect this trope to be amplified to the Nth degree. She becomes almost obsessed with solving the apparent murder of Nadia the stripper, but that won't stop her from lifting the chair in the Bat Mitzvah, GODDAMMIT!
    Oh, yeah. We definitely got to lift the chair.
    • Later, when they're driving back from Richie Osbornenote 's arrest for drug trafficking, she and BoJack start brainstorming and find out there are several missing pieces of the mystery. Diane sports a crazy face and proclaims this a "a real Jill Pill jail fail killer whale caper", only for BoJack to point out she's driving past the speed limit of 35.
      BoJack: You're doing 50 in a 35.
      Diane: (suddenly concerned) Oh, God, you're right.
  • Adventure Duo: With BoJack, on their better days. Their shenanigans often lead to them working together, bantering and simply having fun. This only serves to highlight the difference between the mentalities Diane has in common with Mr. Peanutbutter and the horse: while the former shares her reliability and stableness, BoJack shares her independence and desire to break out of the routine.
  • Affectionate Nickname: Used in both positive and negative contexts.
    • Her mother and brothers call her "Dee-dee" on her return. Then again, given the context of the scene, it's less a term of endearment and more of a condescending putdown.
    • Mr. Peanutbutter also regularly calls her "sweetie", "honey" or other affectionate pet names, playing this trope more straight.
  • Age-Appropriate Angst: While much of her anger in "After The Party" comes from Mr. Peanutbutter organizing a big party for her birthday, her turning 35 is the main reason, since Diane no longer feels happy with the way life has been going lately, and wants to go to Cordovia as a change of scenery and an opportunity to have some sort of meaning in her life.
  • Age-Gap Romance: There is a 15 year age gap between her and Mr. Peanutbutter, her boyfriend later husband.
  • Aggressive Categorism: Downplayed. In spite of her work and proclaimed progressive mind, Diane often employs a rather small-minded attitude towards people, fitting them into only so many reductive, established and settled definitions. It's worse with people she dislikes, disagrees with and/or have pissed her off, at least until she's proven wrong....course, she won't admit it at first, especially when it threatens to change her perspective and when she does, her reactive impulses may have caused a rather bigger problem. For some examples, just look at the way she handles BoJack's and Princess Carolyn's actions regarding One Trick Pony and Sextina's fake pregnancy, as well as how quickly she is to act on her impulse to demonize them when they take decisions involving a refusal of her principles or simply standing in the way and refusing to abide by her vision. It's especially jarring in the second case since Mr. Peanutbutter has to remind her that PC was the one who gave her a job at VIM with no ulterior motive, with her sudden attitude coming to light when she needs support the most. Still, she can come around when she sees the bigger picture and even then, she's never completely wrong in any case. It's just her confrontational attitude that often rubs off the wrong way. In short: Quick to take the negative side of things if emotional, quick to turn on and dismiss people believing the worst if it seems that way but often logical and caring enough to turn around if she finds evidence to the contrary.
  • The Alcoholic: Briefly, after returning from Cordovia and crashing at BoJack's, Diane devolves into a drunken mess as a way to cope with the horrors she saw in the derelict country, fear of confronting Mr. Peanutbutter about the state of their marriage and shame of having "abandoned" him.
  • All of the Other Reindeer: Implied, if not outright confirmed. When Diane returns to her hometown, she only does so to bury her father as a duty that must be fulfilled and being the soft spoken, shy and awkward person she is; it's not hard to imagine Diane as being the solitary Bookworm with no friends.
  • Alone Among the Couples: Diane's comments in "The Telescope" imply that one of the main reasons why she married Mr. Peanutbutter was to not end up alone while the rest settled down.
  • Alone in a Crowd: She doesn't like big parties and can often feel uncomfortable by how easily she's overlooked. Mr. Peanutbutter throwing one for her 35th birthday in "After The Party" (and insisting on keeping it alive far beyond the comfortable) is one of the catalysts of their fight.
  • Aloof Ally: Diane is constantly caught in the paradoxical conflicts of wanting to be noticed and make a difference against her hatred of being thrown into the spotlight, unwillingness to be involved in any sort of capacity to a bigger cause clashing with her refusal to allow anyone to spread the message in any way she deems inappropriate or not the way she envisioned. Such as in "Brrap Brrap Pew Pew", she is often criticizing and pointing out the badness of a situation and how she will not participate in any way, only to go along with it due to peer pressure or actually wanting to do it, all while trying to downplay her participation in order to lose herself into the group.
  • Ambiguous Disorder:
    • Diane exhibits a lot of symptoms of generalized anxiety: She shows a lot of stress and uncertainty about the future, regardless of the way the present is unfolding; often overthinks current situations and can feel exhausted and apprehensive about it; finds it hard to reign in the worry, taking measures that ensure some sort of relief or provision, and not being able to concentrate on something else until the thing troubling her goes away.
    • Averted after she returns from Cordovia: she's clearly suffering from a mild form of Post-Traumatic Stress Disorder after spending a week there and the many bomb attacks that occurred.
  • Amicable Exes: ZigZagged. When she briefly interacts with Wayne, her ex-boyfriend, while he's writing an article on Mr. Peanutbutter, Diane acts quite and a little mistrusting of his true motives, deducing that being The Cynic he is, might try to hurt her relationship with her new boyfriend. While she was right about Wayne's secret disgust with the friendly Labrador, the conversation they have starts hinting that in a way, Diane's quite similar to him, much to her dismay, and is secretly afraid of being Too Much Alike to embrace Mr. Peanutbutter's opinions. Once they lay the cards on the table about what they think, she and Wayne finally move on and establish an actual friendship.
  • ...And That Little Girl Was Me: Eventually reveals to BoJack that one of the main reasons why she's able to understand him and even sympathize with him is her (secret) attachment to Horsin' Around and how it helped her live through her hellish childhood.
  • Angst: While, at first, she seems to be as normal and lever-headed as a simple person can be, as the series progresses, it becomes clear that Diane might be just as unhappy as BoJack is with her life. It's finally confirmed in "After The Party" after heavy implying, when, after she and Mr. Peanutbutter have a serious talk, she confesses to be unhappy with her current lifestyle and wanting a change of scenery. Her depression only gets worse after finding out she matters very little to Hollywoo. However, her response, go to Cordovia to help, only ends scarring her more after being first-hand witness to the many horrors and atrocities of war. Finally, she collapses, gives up, crashing at BoJack and adopting his coping mechanisms. She eventually recovers, but stops asking herself if she's happy in a daily basis since it only makes her depressed.
  • Anti-Hero:
    • A writer with a strong sense of morality, a no-nonsense attitude willing to fight for the overlooked and apologize when she has gone too far who will nevertheless overstep personal relationships and privacy in her search for the truth embodied in her books, who tries to hype up her sense of worth through stories because of the crushing drudgery of everyday life and has an underlying fear that she may be part of the problem instead of the solution or worse that her work may not be important in the grand scheme of things.
    • In terms of classification, Diane nicely fits in between Type I and Type II of the Sliding Scale Of Anti-Heroes, ricocheting between a Classical Anti-Hero and The Snark Knight. It also ties in the dynamic of the group, since she's not as decisive and dirty as Princess Carolyn or as extreme in the ideological scale as BoJack or Mr. Peanutbutter.
  • Anxiety Dreams: Implied for this to be the case with her constant dreams after returning from Cordovia. Shouting "Kinko!" in a surprised, frightened tone after waking up suddenly don't help.
  • Armor-Piercing Question: A few instances. More often than not, this makes Diane stop dead on her tracks and question her motives.
    • "Who are you?"- courtesy of Hank, as a disarming way to get her to back down from accusing him. Especially poignant, since up until then, Diane has been struggling to define who she is and where is her life headed.
    • Another, more personal one happens in "It's You" when she's talking with her friend Roxy about her disastrous visit to BoJack's after his Oscar nomination. Roxy asks her why does she continue visiting him even if he drives her mad. While Diane deflects by saying she just wanted to know how he was doing, she refuses to answer when Roxy asks the following:
      Roxy: And last year? When you came back from Cordovia and needed a place to crash? Oh, you could have stayed with me, or any of your other friends, but you went right to his house. Did you ever ask yourself why?
      Diane: They're filling everyone's glasses. This is insane.
  • Ascended Fangirl: Being a fan of Horsin' Around as an escape from her horrid family life, Diane eventually grows up to meet and write the biography of its star, BoJack Horseman.
  • Asian and Nerdy: Sort of. She's not a stereotypical nerd or TV Genius, but is shown to have intellectual interests and is an acclaimed writer. But on the other hand, the rest of her Vietnamese immigrant family avert this hard, all being a bunch of lazy idiots with no ambitions whatsoever.
  • Audience Surrogate: She reacts as well as a normal person would to the weirdness of Hollywoo, especially when interacting with BoJack or Mr. Peanutbutter. How much is she this varies from episode to episode.
  • Author Appeal: Horses, In-Universe. Her two first non-fiction novels are famous equines's biographies and she eventually writes about BoJack himself. Maybe 'cause she's a big fan of his.
  • Awful Truth:
    • Part of the reason why her attempts to expose Hank fail: NO ONE is willing to believe Diane's claims about Hank Hippopopalous. Seriously, how could such a beloved host do a horrid thing such as sexual abuse towards his secretaries? A kind, caring soul? Who does that feminist expert with back-up research and plenty of evidence think she is? Making it more ridiculous is that she just happened to mention the accusations offhand as a scandal people conveniently ignored (mistakenly thinking they were common knowledge) before things snowballed.
    • Happens again at the end of "What Time Is It Right Now?" when after fighting with Mr. Peanutbutter over something of "hers" turning into something of "theirs" (again), she recalls Jessica Biel's story about being forced to stare at Mr. Peanutbutter's poster of a eye which if looked long enough could form a beautiful image as a metaphor for their marriage failing to make sense anyway but close in view. Then she admits crying that she's tired of squinting (digging deeper) to see it while Mr. Peanutbutter just sits there sad. Neither of them says a word but it's clear to both that their marriage is over.
  • Backstab Backfire: While Diane's betrayal of BoJack's wishes for his autobiography ends up serving a purpose and ultimately proves to be instrumental in convincing him to allow it to be published due to audiences's praise, it's still a betrayal of trust that served as basis in their friendship. This leads not only to an even more emotionally guarded BoJack during the first half of the second season who refuses to give in one inch to Diane, but when the Hank fiasco reaches its boiling point and Diane needs some support, BoJack's very much in the twilight of whether to support her or leave her to dry.
  • Badass Adorable: Although her badasstitude is limited to her writing, actions and sheer moxie rather than actual fighting, Diane is just as willing to use words and well-placed attacks as she is simply being flustered by any kind of compliment, as stubborn as a teenager when something doesn't go her way or capable of elicit sympathy when she feels hurt.
  • Badass Bystander: After some Character Development involving confidence and bravery, Diane starts developing a penchant dislike for atrocities committed against innocent people or, more importantly, women, and as such, goes out of her way to avert the Bystander Syndrome at any chance she gets, be it helping hormone-filled chickens from becoming food in "Gentle Farms"and trying to out Hank Hippopopalous' misdemeanors despite the deck being stacked against her. Unfortunately, she can only do so much for justice, especially if they have too much influence where she lives.
  • Badass on Paper: Part of what keeps her making contacts with pseudo-revolutionaries and supporting herself. For all of her failures and less than impressive records, her actions surely give the media a good scoop regarding her nominal success in matters others recoil at or simply throw their hands out in frustration, with her merits being celebrated rather than its efficiency. Lampshaded by Stefani Stilton in the season 3 finale:
    Stefani Stilton: That shit you said about Hank Hippopopalous last year was supernova red hot badass. It wasn't even on fleek. Fleek was on it.
    Diane: Thank you.
  • Bad Dreams: In "Yes And", after being briefly waken up by BoJack's and Wanda's bickering. It's clear that Kinko's memory is still fresh in her mind.
  • Bad Impressionists: When trying to fake a refugee kid's voice in "Yes And..." to pretend she's still in Cordovia. Luckily, she's talking to Mr. Peanutbutter.
  • Badly Battered Babysitter: It isn't Irving's fault, mind you, but Diane ends up involved in Todd's hiding of "Becka" from Chicken 4 Dayz while babysitting her and it's Irving's insistence and her own stubbornness and desire to make a difference (and gain Irving's appreciation) what leads her to willingly become participant and, eventually, wanted by the Hollywoo PD.
  • Bastard Girlfriend: Similar to BoJack, an unintentional example on her part. Diane is never openly hostile or violent towards Mr. Peanutbutter (hell, she even admits how good of a boyfriend he is) but can often get exasperated with his antics, even if they're made for her; getting worse if she's already feeling very emotional, exploding anytime he feels like teasing. Her guarded attitude also ensures that she's not very capable of opening up to him, to the point of exhausting the Labrador who often tries all kinds of methods to improve the situation. Her self-centeredness and single minded attitude when encountered with a purpose makes her sideline PB in all kinds of situations, often forgetting to tell him things, hiding her location and generally not paying too much heed to him. Less intentional, more "too much personal issues to be in a healthy relationship". In a kinder work, she would become a Trickster Girlfriend. Right where she is, not so much.
  • Belligerent Sexual Tension: While not a full blown brawl fest like others, hers and Mr. Peanutbutter's relationship devolves into this as of season 4, mainly since their marriage has largely becomes sexless at this point and the frequent arguments each of them has with the other over issues they're diametrically opposite in disagreement, as well as the fact that Mr. Peanutbutter agrees with everything to keep the public support and is being guided by Katrina through hand in every step of the governatorial campaign. This is not portrayed as a good thing, however: if anything, it's done to portray how increasingly desperate both of them are to work things out and how increasingly they're running out of options.
  • Beneath Notice: Downplayed. She is not averse to being noticed or talking with people, but she would prefer it if it was on small doses rather than a crowd. See The Nondescript below for the way she does it and its consequences.
  • Bare Your Midriff: Her white blouse leaves her belly button exposed.
  • Berserk Button: As a third wave feminist, woman being mistreated and slut shamed. These two happening in front of her is what pushes her to continue pursuing the case against Hank.
  • Betty and Veronica:
    • The Archie to BoJack's irascible, yet charming Veronica and Mr. Peanutbutter's reliable and warm Betty.
    • In the sense of being Mr. Peanutbutter's wife, Diane's the sensible, down-to-earth Betty to Katrina's and Jessica Biel's cruel, abusive and manipulative Veronica.
    • On the context of her relationship with BoJack, she's the friendly, supporting Betty to Princess Carolyn's demanding, tough and determined Veronica.
  • Big "WHAT?!": More like "Long What". In "Our A-Story is A D-Story", she exclaims this when Princess Carolyn brings up that BoJack may have a crush on her, not believing it at all. Then again, since Diane exclaims it in the same tone as BoJack, it might be something else..
  • Birds of a Feather: With BoJack. They both come from horrible homes and Diane sometimes can be just as cynical as Bojack. Deconstructed in season 3 when Diane explicitly states they bring out the worst in each other because they're so alike.
  • Black Sheep: Not literally (since she has a black sheep adoptive brother), but she fits the figurative meaning of the trope, being The Unfavorite in a family full of Jerkasses.
  • Bonding Over Missing Parents: More like "Bonding over Abusive Parents" with BoJack.
  • Bookworm: To some degree, since she's an author.
  • Book-Ends: Diane and Mr Peanutbutter's engagement/marriage begins and ends with Mr Peanutbutter making a grand romantic gesture that Diane ultimately doesn't feel comfortable accepting. Immediately after Mr Peanutbutter asks Diane to marry him with "just the two of them, no cameras" there is an immediately surprise party and a scene where Diane calls Bojack and is clearly not happy. It ends when Mr Peanutbutter recreates a childhood fantasy of Diane's without realising why it wasn't something he should have done and why Diane can't appreciate it.
  • Boots of Toughness: Always wearing a pair of boots as part of her main outfit. And of course, she's one of the most confrontative characters.
  • Boyish Short Hair: As part of her new post-divorce look in season 5.
  • Break the Cutie: Season 5 is not kind to her and arguably puts Diane through the most trauma of any season so far.
  • Break-Up/Make-Up Scenario: At the end of "After The Party", Diane and Mr. Peanutbutter talk about their marriage and agree to give each other some time by Diane finally going overseas to Cordovia for charity work and Mr. Peanutbutter focusing on his new show, since they no longer seem to be completely happy with each other, Diane especially. After a disastrous trip (and several haunting memories of the war), they both finally reconcile their feelings in "Out To Sea".
  • Break Up to Make Up: A rather depressing example. Entering season 2, Diane starts to feel more and more underwhelmed over the fact that there's no intrinsic value in what she's doing currently (consultant in Secretariatnote ; simply discussing events to no one concernnote ) and her relationship with Mr. Peanutbutter hits stagnation levels as a result. She decides that she needs to focus on what she wants to do to find what's she good at and maybe find some self-worth along the way that will help her mend up. So she goes off to Cordovia, a ravaged country, as a biographer for Sebastian St. Claire, a Wealthy Philanthropist, as a way of helping out. Three guesses how it went.
  • Broken Messiah: Invoked. Diane may still retains her best qualities, but at the beginning of the series, she was a borderline All-Loving Heroine with a friendlier, more idealistic outlook on life to start with, content with where she is, an idea of where to go next, willing to not judge anyone for their actions unless called for and lock horns against anyone who might stand in the way. As her past comes to light and setback after setback starts kicking in, not only does Diane demonstrates unfettered self-interest in her pursuits, but also realizes that she may be far less of a good person herself than she might have initially thought.
  • Broken Pedestal: Diane has had her share of disappointments, most of them coming from people she has looked up to.
    • Diane suffered a major disappointment when BoJack vetoed her idea for the biography and promptly fired her. This case was a lot more complex, since they were able to mend up and Diane also went behind BoJack's back to publish the first chapter as a sneak peek against his wishes.
    • To Sebastian St. Clair, the philanthropist who she abandoned LA to write about. After spending enough time around him, she comes to see him as a self-important narcissist who is more obsessed with looking good while helping people than actually helping people.
  • Broke Your Arm Punching Out Cthulhu: At the end of her crusade in "Hank After Dark", Diane has gained nothing but scorn and defeat from it. Hollywoo has succeeded in drifting interest away from the abuse accusations against Hank, she has received death threats through the mail and no support at all, not to say being personally threatened by THE HIPPO HIMSELF and the people she trusts the most (BoJack and Mr. Peanutbutter) haven't been of any help. The eventual outcome finally convinces her to travel to Cordovia and to add insult to injury, while waiting to aboard her flight, a random stranger says this to her:
    Man: (to Diane) Smile!
  • Brooding Boy, Gentle Girl: Although she is more of a mixture of gentle and byronic, she was one part of this trope with Wayne in the past.
    • Nowadays, Diane has a more platonic (maybe) version with BoJack.
    • Her relationship with Mr. Peanutbutter is a Gender Flipped version of the trope: Diane is troubled, torn between cynicism and idealism and full of doubts while he is caring, quite lightheaded and simply soothes her worries.
  • Bulletproof Fashion Plate: Despite roaming through ruined Cordovia and interacting with refugees, dirt and deplorable conditions, Diane never comes out with ragged clothes or worse for wear, at least physically.
  • But Not Too Foreign: She's Vietnamese-American; nevertheless, she prefers to downplay as a way to avoid standing out that much. Not that it will keep her from arguing the opposite. Lampshaded in "Live Fast, Diane Nguyen":
    Diane's brother: All the jobs are going to immigrants these days. What do you—
    Diane: We're immigrants.
    Diane's brother: How do you figure?
    Diane: (frustrated) We're Vietnamese?
    Diane's brother: (defensive) Step off! We're American as Pho!
  • Butt-Monkey: Almost to the level of BoJack, although not as much as Todd. Diane came from a family in which she was the most tortured one, with everyone ganging up on her, eventually growing up, moving to Hollywoo and being constantly disillusioned about ideals and people, traumatized by events other people often overlook, constantly ignored and berated and often feels useless and unimportant believing she will never reach her full potential or make an impact on the world. Downplayed in her Hollywoo misadventures, since part of her misfortune there comes from her own hubris and pride.
  • Byronic Heroine: A rare mixture of this and The Ingenue. Diane is far from being openly vitriolic toward anyone; otherwise, she fits enough criteria to qualify for the title: Troubled? Her childhood was never ending torment that has refused to leave her even in adulthood and left her desperate to achieve some sort of justification for her existence, often in the form of struggles for grand justice. Selfish? Well, she's certainly willing to throw people under the bus if she feels it needs to be done, be it romantic partner, friend or ally. Willing to, though not basking in the act itself. Brooding? A plethora of traumas and self-doubt often leave her very cynical over the nature of life, happiness and ultimate purpose as nothing more than fairy tales. Determined? Unless it's beyond her capabilities or causing more trouble than it's worth it, she won't throw the towel at any obstacle she faces. Intelligent? She's often too good for what she does for a living in Hollywoo, per her best friend's words and can be quite the cunning Manipulative Bastard if she puts her mind to it. Attractive? She has certainly attracted the interest of several male characters in the series and is an example of a really Hot Librarian. Conflicted? Pfft, she's often at crossroads whether she has to chose self-benefit or support of others and her failures, as well as the damage it has caused to her loved ones often feeds her self-loathing. No wonder she's friends with the series' male Byronic Hero himself, BoJack.
  • Bystander Syndrome: Hates this kind of attitude towards important issues. This is part of why she chooses Mr. Peanutbutter over Bojack and why she goes out of her way to call out and speak up in light of the Hank Hippopopalous scandal, while others like Mr. Peanutbutter keep mum or are pessimistic about changing anything like BoJack.
  • The Caretaker:
    • Briefly, to Irving Jannings, with whom she tries bonding while Irving's mother, Kelsey, is filming the Secretariat Biopic. The playdate starts poorly until Todd meddles in and, well, see Badly Battered Babysitter above.
    • She also becomes this to Kinko during her stint in Cordovia, reading to him and giving him a taste of a normal childhood. This only makes it more tragic when a bomb attack occurs and he is killed.
  • Cassette Craze: During her slump at BoJack's in "Out To Sea", Diane starts speaking to her own tape recorder, doing a record-keeping of each and every single one of her thoughts and ideas as a means to keep herself entertained. Sounds about as well as anything to do; after all, why even try to make it a reality? Any attempt so far has resulted in failure and so has every decision made on her own accord. She just prefers to keep knitting dreams, they're easier than creating realities. And, as long as she keeps rambling, there's no need to go out and face reality again, is there?
  • Cassandra Truth: See Awful Truth above. No matter how many times does she try to convince people of otherwise, no one wants to believe her claims about Hank Hippopopalous. The media doing nothing but badmouthing her in hopes that the scandal will just blow over doesn't help.
  • Change the Uncomfortable Subject: Once the Armor-Piercing Question mentioned above is asked, Diane decides to continue pushing the subject of free glasses of water in the diner they're at to the point of making a scene despite Roxy insisting on an answer to her question.
  • Character Development: As each season has come and go, Diane has grown and matured in big and small ways.
    • Diane started the series as a rather meek, mousey girl whose presence was as small as her height, with her basically shuffling through the party silently when meeting with BoJack for the first time and her interactions with Mr. Peanutbutter being more of a supporting kind while biting her tongue about some personal criticisms of his actions. As the season progressed, Diane slowly but surely started to develop more confidence and assertiveness in what she believes and less insecurities and awkwardness towards the people of Hollywood, even if she still has some problems with knowing when something can be truly be pushed too far. E.g. look at her reaction of acceptance in "Later" when Mr. Peanutbutter dissuades her from assisting Sebastian St. Claire with her scene in "After The Party" when she yells, confronts and convinces Mr. Peanutbutter to support her trip overseas.
    • Her bigger outspokenness has resulted in a more eloquent approach to things. Diane would initially be ashamed and afraid of being thrown into the spotlight due to her insecurities with people and tendency to shove her foot on her mouth. Once she got the hang of it and became more convinced of what she needed to do, Diane started articulating her speeches more precisely and measuring each word and its use carefully. By the time she confronts Hank Hippopopalous's supporter Cardigan Burke in MSNBSea, she displays a rather excellent use of vocabulary and the impact of some phrases. Even more telling is her maintaining an even temper and a willingness to reason through all the insults and bold faced trolling and rage baits thrown at her during the interview.
    • A more subtle development is how she eventually starts taking other people's emotions into account when it comes to her actions. Once she realizes how truly hurt BoJack is about the premature release of his biography behind his back, she genuinely if stiffly apologizes to him. As her marriage with Mr. Peanutbutter continues to crumble due to her independence bordering on selfishness, she starts making more of an effort to actually express herself more openly and be more understanding of his emotions and desires. After a spat in season 3 with Princess Carolyn over Sextina Aquafina's handling of the abortion issue and deciding to become the whistle blower for the whole farce, she eventually comes around after realizing how much PC has done for her, how much she needs it and how it can be used to do some good, even if she doesn't agree with the approach wholeheartedly.
    • There's also her self-reliance built through each season: back in season 1, she would often prefer to simply hang on to Mr. Peanutbutter and try to be as passive as possible, even if she wanted to say something out of fear of not being able to stand out on her own. Once she starts interacting with BoJack and by extension Hollywoo, she starts taking more independent routes without the help of her husband or her friends, even going against them in certain occasions when she doesn't agree with what they're doing or simply making decisions concerning herself only. This has had some mixed results: (staying in Bojack's house after returning from Cordovia and deciding not to tell Mr. Peanutbutter about it, quitting Princess Carolyn's agency after a disagreement over the handling of abortion, deviating from route to Ojai to solve a mystery and staying overnight.)
    • Diane has also started to realize that she might need to find happiness on her own without anyone guiding her towards it, especially after Cuddlywhiskers's speech in "BoJack Kills", even if her vision of what she truly needs and wants might not be the same as her friends.
    • She was also broken by her experiences outside the bubble and comfort of Hollywoo, such as traveling alongside Sebastian St. Claire through third world countries and seeing people such as Kinko die. This leads her to realize that supporting causes and actually helping are two different things, although it takes only after being traumatized by such experiences and almost going through the Despair Event Horizon and even beyond.
    • Finally, the importance of being noticed to carry weight on her statements hits her like a ton of bricks in episodes like "Brand New Couch" and "Hank After Dark", especially when she wants to go after some rather famous bastards and has no backup in any sense or form.
  • Character Filibuster: Played for Laughs in "Prickly Muffin" when asked by BoJack what does she think about Sarah Lynn, Diane then goes into a long and detailed rant admitting that while greatly admiring her early work which played around the typical conventions of teenagers in media, she wonders if it's possible to reclaim their identity as females by embracing such concepts or it's just plain self-delusion to feel more comfortable with reality. The clueless horse just goes along with it.
    Diane: But you know, on the other hand, I worry that conversations like this one often dismiss her as a mere puppet of the industry—
    BoJack: That's my same worry.
    Diane: —incapable of engaging in these discussions herself—
    BoJack: Obviously.
    Diane: —and infantilization, which is itself a product of the deeply misogynistic—
    BoJack: So deep.
    Diane: —society we live in.
  • Character Tic: Running a hand through her hair when she's nervous.
  • The Chew Toy: In-Universe. In "Live Fast, Diane Nguyen", it's revealed that Diane was this to her entire family, especially her brothers who enjoyed tormenting her.
  • Cigarette of Anxiety: In "BoJack Kills", Diane goes outside to smoke a cigarette and ends up sighing when she is called by Mr. Peanutbutter. Worse of all, it's implied their marriage is going From Bad to Worse judging by his icon and name in her contacts: "Husband".
  • Closer to Earth: Only by comparison to the main cast. When she's faced to a Real Life situation like war in Cordovia, she's out of her depth.
  • Closet Geek: A secret fan of Horsin' Around, much to BoJack's surprise.
  • Clueless Dude Magnet: Diane is surprised and uses a Big "WHAT?!" in a similar fashion like BoJack when Princess Carolyn calls to her attention the attraction both Mr. Peanutbutter and BoJack have for her.
  • Commonality Connection: She and BoJack start out as cold toward each other, but after traveling to attend Diane's father's funeral, both manage to find common ground over their crappy childhoods, mutual cynicism and search for purpose.
  • The Complainer Is Always Wrong: How the entirety of Hollywoo sees her crusade against Hank. Inverted, since she's clearly doing the right thing, even if it's not the wisest thing, while Hollywoo's "forget-and-forgive" is nothing more than selfish Pragmatic Villainy.
  • Confess in Confidence: One of the main reasons why BoJack and Diane's friendship collapses in the 1st season is because Diane wrote every single detail of the former's life in paper, no exceptions, even when it would have been best to keep some details secret. She was his autobiographer, after all.
  • The Confidant: She eventually becomes this to BoJack. It's two sided, as BoJack has become hers as well.
  • The Conscience: Usually provides a moral and sensible contrast to BoJack's self-centered, off-the-wall antics and schemes, as well to her husband's obsession with positivity and desire to cling to a perfect reality.
  • Consolation Backfire: During the journey back from Herb's house, trying to break the awkward mood, Diane comments that at the very least, this will be a funny anecdote to tell at Herb's funeral. This is enough to make BoJack stop the car to cry.
  • Convicted by Public Opinion: During Diane's campaign against Hank Hippopopalous, the public slowly starts to revolt against her, due to the unwavering belief in Hank's "innocence" of the sexual charges against him. This attitude is only exacerbated by the Hollywoo media doing its best to dampen her credibility, which devolves into receiving death threats through the mail and Hank himself eventually.
  • Cool Loser: A pretty cool and chill person in general, despite not having a high position or unlimited connections like most of Hollywoo.
  • Country Matters: One of the threats she receives during "Hank After Dark":
    Diane: (reading letter) "You can't, you stupid ugly can't."
    Mr. Peanutbutter: That doesn't say "can't".
    Diane: Oh, my god.
  • Curb-Stomp Battle: Downplayed. While the campaign Diane kickstarts against Hank never reaches the heights needed to properly discredit him as a household name, it does pose a threat towards tarnishing his image, which only speeds up Hollywoo's necessity to quiet it down. Played more straight when the counter campaign works and leads Diane into a wall.
  • Curse Cut Short: When she finds out in "Love And/Or Marriage" that she's pregnant, this leads to a hilarious subversion of Precision F-Strike, the word being cut in half and continued in the next episode "Brrap Brrap Pew Pew":
    Doctor: Do you not know? You're pregnant.
    Diane: Motherf—
    (next episode rolls)
    Diane: —ucker!
  • Cute Bookworm: Oh, yes. You'd be hard pressed to find a more Adorkable Bookworm. Think Phoebe Heyerdahl's diligence and nice attitude with Twilight Sparkle's neuroses, easily flustered attitude and anal retentiveness and Daria Morgendorffer's cynicism and snark. Now, if only she was as lucky and effective as those three...

    D-H 
  • Daddy's Girl: While talking with BoJack about the little privacy she has back home in "BoJack Hates The Troops", Diane mentions as being accustomed to sitting on the roof since she used to go there with her dad when she was little to look at the stars. This turns to be a lie.
    • In reality, everyone in Diane's family was a despicable, unlikable person. Her father was the worst of them all being "a mean, sadistic alcoholic who never supported anything (she) did and actively delighted in seeing (her) fail."
  • Damned by Faint Praise: More than once, she does this towards Bojack. The most prominent instances:
  • Dark and Troubled Past: Diane's upbringing wasn't the best, to say the least. In the present, her mother constantly guilt trips her about leaving her family... a family who did nothing but torment and belittle her. There's also Diane's father, who contrary to what she said to BoJack, was just as abusive as BoJack's parents.
  • Dark Secret: She used to watch Horsin' Around when she was little. While she argues more of maintaining objectivity in her relationship with BoJack as the reason why she never told him, it's most likely she was just ashamed of saying it.
  • David vs. Goliath: In season 2, she involves herself in a crusade against Hank Hippopopalous, a known and beloved celebrity host, for his mistreatment of women, playing the David to Hank Hippopopalous (and the rest of Hollywoo)'s Goliath.
  • A Day in the Limelight: Diane's are "Live Fast, Diane Nguyen" in season 1, "After The Party", "Chickens", "Hank After Dark", "The Shot", "Yes And..." and "Out To Sea" in season 2; "The BoJack Horseman Show", "BoJack Kills", "Love And/Or Marriage", "Brrap Brrap Pew Pew", "Old Acquaintance", "It's You" and "That Went Well" in season 3.
  • Daytime Drama Queen: During her stay with Bojack in "Yes And", she starts watching Horsin' Around episodes on the TV as hobby and pastime, in a manner not too dissimilar from Bojack. Justified as she's clearly depressed and probably wants to forget about everything.
  • Deadpan Snarker: Not to BoJack or Princess Carolyn levels, but she can do the occasional quip, often mixed with bluntness and condescending attitude.
    • "The Telescope": When BoJack insults Todd while he's talking about his betrayal of Herb and he asks what they were talking about.
      You were about to tell a story about you being a shitty friend, but then, we got interrupted by you yelling at Todd.
    • "One Trick Pony": When Diane and BoJack compare their reunion after the former gets married to returning from vacation to class, she only has this to say about the ol' school days.
      Yeah, well, I hope the cheerleaders don't stuff me in a locker and write "virgin slut" on my forehead, and then when I ask how I could be both a virgin and a slut, they make me eat a lipstick.
  • Dead Sparks: By the end of season 4, this is what hers and Mr. Peanutbutter's marriage has devolved into. It says something neither is keen in entering their new house to continue living together or Diane just doesn't have the strength to keep putting the work in their marriage.
  • Deconstructed Character Archetype: Of the teen snarky crusader; in this case, becoming all grown up and disillusioned by her future in a corrupt, morally grey business that makes her feel just as an outsider as she was back home. This swift change also shows a much darker motivation beneath the seemingly altruistic desire: recognition and fame from much dumber peers.
  • Despair Event Horizon: After realizing that she's not the Intrepid Bookauthor she thought she was and she can't make big a difference as she wants, she spends two months simply wallowing around BoJack's house and being just as pessimistic about life as he is, to the point of driving BoJack towards a regression of his old self.
  • Desperately Looking for a Purpose in Life: Season two makes this most obvious.
  • Deuteragonist: Diane is, alongside Princess Carolyn, the second most important character besides BoJack.
  • Devil's Advocate: Often plays this, mostly to BoJack, as a way to put things into perspective and show a more objective viewpoint. See Damned by Faint Praise above for an example.
  • Didn't Want an Adventure: Diane more often than not desires for opportunities for making an impact come her way without any of the downfalls or conflicts. Whenever they come (Hank controversy, Cordovia, Nadia's "murder"), Diane usually ends up wishing she had thought before speaking and doing, at least to some degree.
  • Disappointed in You: In a similar manner, after a little too much verbal retribution and spite:
    BoJack: You know what your problem is? You think you're so much smarter than everybody. Well, guess what? I spent as much time with you as you did with me. Why don't I write a book about how you married Mr. Peanutbutter because he's too dumb to see how much better you think you are?
    Diane: Okay, I know you're upset—
    BoJack: I'm not upset, I'm just sick of nerd-girls like you beating up on stars like me. It's pathetic! I'm sorry no one wanted to date you in high school, Diane. But I don't see why I have to suffer just because you were never especially pretty or interesting.
    Diane:...You really let me down, BoJack.
  • Divergent Character Evolution: Played for Drama. Diane starts the series in the same page and with the same attitude as Mr. Peanutbutter, never arguing and always being happy in each other's company. The more Diane develops independence and individual goals in mind and the more Mr. Peanutbutter is left behind due to his adherence to his old ways, the more and more they start arguing and drifting apart. Which is not to say they completely disagree in everything. Or have stopped loving each other. Just that...they might want different things and neither wants to give in completely. It's clear that the Character Development they're going through is good for both of them, even if there's the implication they might not work together at all if they continue growing separately as people.
  • Does Not Like Guns: Zigzagged. While she admits to being anti-gun, she also quickly becomes an advocate for women carrying guns because of the fact that men don't know what it's like to feel unsafe walking down a street with nothing to protect them.'
  • The Dog Bites Back: After seasons of putting up with Bojack, Diane finally snaps when he makes the mistake of suggesting that the two of them are Not So Different. She retaliates by writing a scene based on the Penny incident into the script of Philbert, essentially forcing Bojack to relive one of his greatest failures and deliver a stealth-confession on set.
  • Do You Want to Copulate?: Whatever their feelings may be, Diane's proposition to BoJack in "The Dog Days Are Over" after a long wine drinking night is just...cringey. At least, she could chalk it up to being drunk.
  • Drowning My Sorrows: After returning from Cordovia earlier than expected.
  • Dude Magnet:
    • BoJack became smitten with her due to their similarities in personality and childhood. He even tried to sabotage her upcoming wedding to Mr. Peanutbutter.
    • Mr. Peanutbutter is madly in love with Diane.
    • Wayne, her ex-boyfriend, still has feelings for her and believes they belong together.
    • Alexi Brosefino is implied to have to come to like her by the end of his debut episode, which is telling, given how he mistakenly sent his text to her, thinking it was another Diane he wanted to hook up with.
    • In a darker example, an aggressive jerk tries to flirt with her in "Thoughts and Prayers", but he was not a good guy.
  • The Dutiful Daughter: She returns to her hometown to bury her dad and is the only one to organize the funeral or care to assist. That, despite the fact that her family has never done any favors to her.
  • Easily Forgiven: By Mr. Peanutbutter during the second season finale. Deconstructed in season 3, when it's revealed that they went to marriage counseling, and he still has trust issues in regards her.
    • Subverted with the book she wrote about Bojack. He was furious when he read the draft (though he ultimately admits it's not so much about what the book might do to his public image as it ultimately benefited that, but more that it upset him to think Diane saw him like that), and even more so when she responded to his refusal to allow it to be published by leaking the first chapter. When the book was a big success and did boost his notoriety to the point where he started getting job offers again he tells Diane that he's forgiven her, but his behaviour towards her says otherwise. He's a lot more on guard around her for a long while and tends to make numerous backhanded remarks about her when she's there. In the end he does ultimately forgive her for real but it takes a good long while to happen.
  • Eating the Eye Candy: In season 3, it's shown that Mr. Peanutbutter took off his shirt when they first met, and she was certainly enjoying it.
  • Embarrassing Nickname: More like "Mocking Nickname". She'll always be known as "Cry-ane" for her brothers and "Princess Di" by her mother.
  • Embarrassing Slide: A particularly cruel version of this trope. Despite Diane's pleads not to, her brothers end showing Bojack the "Cry-ane" video, which details how they tricked her into believing she had a pen pal named Leo and they later set her up (and filmed her) with a hobo as her prom date.
  • Emotionally Tongue-Tied: Subtle, but in "Hank After Dark", it's shown that Diane has a bit of trouble expressing regret, even if deep she knows that there's every reason for doing so.
  • Establishing Character Moment: Diane's first onscreen appearance is almost unstated, with her coming out behind BoJack during the party, showing her as ''different'' to the rest of Hollywood. The distance and brief talk between her and BoJack show them becoming pretty intimate with each other, with BoJack being able to open up a little. Then we discover that she's Mr. Peanutbutter's girlfriend, highlighting her odd choice of men and becoming the unobtainable for BoJack. Yet, despite hearing BoJack insult Mr. Peanutbutter, she never once calls him out, proving her to be very patient. Plus, she Wrote the Book about Secretariat, BoJack's childhood hero.
  • Everyone Has Standards: She was about to drop the whole issue with Hank after seeing the many complications it was giving her. Then, her Berserk Button was pressed. See Rage Breaking Point below.
  • Expy: Physically, she resembles Daria Morgendorffer from the eponymous series, with some of the same moral principles applied to her persona, although she's a deconstruction of the character. Lampshaded by Sarah Lynn in "That's Too Much, Man": "That's her deal, right? Pretty much Asian Daria?"
  • Extreme Doormat: To her family, and as it turns out, in general as compared to the rest of Hollywoo. She really, really hates this part of herself.
  • Face–Heel Turn: She makes one in "INT. SUB" after she gets sick of Bojack ignoring her boundaries.
  • Failure Knight: Through Character Development and the harsh realities she faces, Diane devolves into this in season 2. She just doesn't catch a break during the majority of her season story arc. First, there's the Secretariat movie, in which she's reduced to nothing more than an assistant; then the chicken issue, which while mildly successful, was more of Pyrrhic Victory since only one of the chickens was saved; then the Hank crusade ending in a fiasco as everyone backlashed against her for speaking the truth; then the Cordovia business where she saw the horrible truths of war and lost whatever confidence she had left; and finally, her debauchery spiral at BoJack's house. She gets better, but she could have lost herself in that last one hadn't Princess Carolyn intervened...
  • Fatal Flaw: Her significance to get the truth out has also caused harm amongst others. When she tries to prove Hank is guilty, she ends up making herself look bad by the public and turns out she hasn't considered the feelings of her friend BoJack or even her husband.
  • Females Are More Innocent: Played With. While far more moral than half of the main cast, stands up for what she believes in as well as more sensitive in empathy than BoJack and Mr. Peanutbutter, Diane is still willing to let self-interest and beliefs trump over feelings or loyalty.
  • First-Name Basis: When BoJack struggles about how to refer to her (full name or just the surname) during their first meeting, Diane simply tells him to call her by her first name.
  • Fish out of Water: Diane hails from Boston, is an acclaimed writer and a quiet person in general who hates being in the spotlight unless necessary, yet stands firm by what she thinks is right and isn't above wanting to have some fun. However, as the show presents and as she finds out, the dog-eats-dog world of Hollywoo doesn't care for those things, thinking nothing of her as an individual, writer or woman, morality she's ill-equipped to face.
  • Foil: More than they seem..
    • Her biggest foil is BoJack. She zigzaggs between this and to be almost the Distaff Counterpart of him at times. He and Diane are pretty similar: Terrible childhoods, intellectual, quite cynical and Determined Defeatist attitude. Diane, cynicism aside, still believes in ideals and a better world, although not as dedicated as she used to be. BoJack has Stopped Caring and has a huge case of Bystander Syndrome.
    • Princess Carolyn is an Older and Wiser version of who Diane could become if she sinks into job as a form of self-satisfaction without any sense of life outside of it. Especially notable in that while Diane is married and has no desire to have any children only to get pregnant and decide to terminate it, Princess Carolyn finds it increasingly difficult to hold out any hope of finding someone and starting a family. Lampshaded to hell and back in "Brrap Brrap Pew Pew" when Diane gets an abortion and accidentally tweets about it as if it was her client Sextina Aquafina who had done it: as their conflict draws to a confrontation, Princess Carolyn mentions how Diane's stand against her and Sextina's Fake Pregnancy scheme is kind of hypocritical given how she seemed okay as long as it was the way she wanted it to be and sarcastically responds how bad it is she's still able to have children and able to live outside of this kind of work.
    • Mr. Peanutbutter is her exact foil. Diane, being sour and pessimistic in a real down-to-earth way, is at odds with her husband with his happy-go-lucky attitude, soaring ambition and blindness to shortcomings. As their characters develop, their previous amiable marriage starts to crumble as their differences become more and more overt.
    • Like Charlotte, Diane is also gentle, caring, a bit on the cynical side and can be resourceful on her own. The main difference is that Diane ultimately has the same ambition and underlying darkness as BoJack, choosing to stay in Hollywoo while trying to maintain her integrity. Charlotte, however, knows the score especially with having no business in L.A. and prefers the countryside without any major worries or grand dreams to hang on to. To say nothing of the most obvious parallel: their status for BoJack for The One That Got Away with Diane being in the middle of BoJack's relationship with women along Princess Carolyn.
  • Foolish Sibling, Responsible Sibling: The Responsible to her brothers' Foolish Sibling.
  • For Great Justice: Her reasons behind trying to expose Hank Hippopopalous come less from being explicitly interested on helping the women, since Diane was aware of their cases way before doing something, and more because the public and media dismiss such accusations as nothing more than defamation caused by attention seekers or liars, without digging into whether they're true or not.
  • Force and Finesse: Finesse to Princess Carolyn's Force, being reliant on arguments, persuasion and non-confrontational methods to succeed and loves being in the spotlight despite her nervousness while Princess insists on being front for everything, is very aggressive for a bureaucrat, loves winning and can't help but be a showoff while being the Man Behind the Man.
  • Forceful Kiss: Receives one from BoJack after he has a messy fight with his former friend Herb and Diane comforts him.
  • Foreshadowing:
    • For all of her presentation as a Daddy's Girl as a bonding exercise with BoJack, Diane's utter indifference at the revelation of her father's death is the first indication that there wasn't a good relationship between them.
    • Before she's revealed as a fan of Horsin' Around, Diane calls attention to the fact that the house had two sets of stairs, having never understood why.
  • The Generation Gap: Deconstructed in her marriage, starting in season 2. Diane is 35 years and Mr. Peanutbutter is pushing beyond 50. Despite working constantly to make their relationship work and mostly succeeding, it's clear that their life agendas couldn't be more different: Mr. Peanutbutter, despite his energy and niceness, is an Old Dog, way too accustomed to his ways and not that willing to challenge beyond what he has. Diane, on the other hand, is 35 and still has the opportunity (and desire) to allow herself onto wonders, experimentations, and experiences before settling into a permanent commitment, but because of her love towards Mr. Peanutbutter and how stable and loving their marriage is, it's hard for her to completely give in to what she wants, which causes further friction between the two of them.
  • Good Cannot Comprehend Evil: She's unable to complement both sides of Sebastian St. Claire's good actions and his selfish motives. She can understand the thought and act of helping people, but the detachment and selfishness oft involved in such activities as nothing but a PR move escapes her understanding.
  • Good Girls Avoid Abortion: Averted. Diane gets pregnant and she and Mr. Peanutbutter mutually decide that they do not want to have children and opt for an abortion since it would be the best for them. The conflict in this plot line stems not from any uncertainty or moral qualms with the decision, but from Diane's work as the writer of pop star Sextina Aquafina's Twitter page, where she accidentally tweets about her planned abortion and it appears that Sextina is the one who plans to have an abortion. This leads Sextina to embrace the role of being the face of pro-choice as a stunt campaign, taking it way too seriously. Diane soon starts objecting to such displays like the outrageous video "Get Dat Fetus, Kill Dat Fetus" since it not only, from Diane's perspective at least, is a wasted opportunity of saying something truly groundbreaking, but it basically gives enough mileage for the pro-lifers to attack and sway people to their version. However, upon talking to someone in the abortion clinic, she realizes Sextina's raunchy approach helps to downplay the scariness of the situation for the people involved and may actually be helpful in a more meaningful way.
  • Hannibal Lecture: Receives one during her private reunion with Hank Hippopopalous when she tries to convince him to come clean about his charges: Diane doesn't really matter in the grand structure of Hollywoo. Soon, as Hank says, he will be forgiven and all about his case will become ancient history. Her accusations and insistence about it, however, will continue to cause trouble for her and the people she cares about.
  • Happily Married: Deconstructed with Mr. Peanutbutter. "Happily" doesn't translate to "totally functional". By season 3, their marriage has become so strained that the "happily" part is questionable at times. Then, in season 4 it seems they still have some opportunity to be together only for their personal issues and building resentment to break the camel's back, making both the "happily" and "married" not forthcoming choices.
  • Happy Place: Horsin' Around used to be her refuge when she was little and lived with her insufferable family, as she tells BoJack. No wonder she slipped into watching old episodes of the series when depressed.
  • Hard-Drinking Party Girl: After returning from Cordovia, she crashes Bojack's house, curses and drinks like a sailor and spends her time goofing off and slacking the time away.
  • Has a Type: Diane has dated, been interested in, or is married to good men.
  • Headbutting Heroes: With Princess Carolyn in "Brrap Brrap Pew Pew". She's also this usually with Mr. Peanutbutter when they both reach a stalemate over what they think they should do. Surprisingly averted with BoJack: be it helping each other through advice, obsessing over similar things or sinking through pits of despair, they always seem on the same page.
  • Heroic Bystander: As detailed in Badass Bystander, Diane has become more and more proactive when it comes to issues she considers important to defend, most of which are often overlooked or dismissed by her Hollywoo friends and contemporary. Zigzagged, however, in that while her reasons to do so stems partly from a genuine desire to do some good, they're also desperate attempts to find some major purpose she can dedicate her life on.
  • Heroic Wannabe: Diane always wants to make a change. So. Very. Much. However, because of her nature, refusal to compromise, insecurities and general inability to deal with the fallout, she always falls short of achieving it and she won't just quit no matter how inconvenient it is, all to feed her own self-esteem and ego. It doesn't mean she doesn't care about the cause, she just can't help but want to be important while doing good, even if she fails constantly. Still, she has scored a few victories here and there.
  • Hero with Bad Publicity: After denouncing Hank Hippopopalous of sexual abuse with his secretaries, she is booed and even threatened by society.
  • Heterosexual Life-Partners: With Stefani Stilton in season 4.
  • Hilariously Abusive Childhood: Deconstructed. Diane's miserable experiences were fun to someone: her brothers and parents. To her...not so much.
  • Hollywood Healing: Played With regarding her trauma after the Cordovia situation. Diane does eventually recover rather fast, but it takes her taking long naps, distract herself from the issue and even falling into a depressive state at BoJack's house to even consider moving on with her life again.
  • Hollywood New England: According to "Live Fast, Diane Nguyen", she hails from Boston, since her family is based on obnoxious stereotypes from Boston.
  • Hot Librarian: While lacking the bun, Diane has this down to a science. An attractive, yet reserved and moral woman who's clothes barely manage to hide any beauty, has a Hollywood Nerd vibe to her, prefers to concentrate on work rather than to have fun, can be kind of a wet blanket to her husband, and has more than one man interested in her? Diane rocks this trope.
  • A House Divided: Increasingly as the series goes on:
    • The first major one was about Diane's desire to go to Cordovia to work with Sebastian St. Claire which was postponed at Mr. Peanutbutter's urgence in "Later".
    • Then, a fight breaks out in "After The Party" when Diane explodes over Mr. Peanutbutter needling her on facts and decisions about what she knows and wants.
    • During Diane's battle against Hank, she tries to get Mr. Peanutbutter's support on the subject, but Mr. Peanutbutter, in order to keep his job, is forced to side with the network and tries to dissuade her from continuing. Their diverging ideas and agendas only further the wedge between them.
    • The lack of communication between them, Diane's inability to express her feelings and Mr. Peanutbutter's pushiness masked in a cheerful façade in "Love And/Or Marriage" are also big factors in the somewhat stagnated process of couple's therapy. Once Diane takes some Gush, she expresses herself more openly mending the damage.
    • While staying in the Labrador Peninsula, Diane notices something is troubling Captain Peanutbutter, PB's brother. When she tries telling him, he dismisses her worries turning angry and even insulting her when she keeps insisting on the subject.
  • Huge Guy, Tiny Girl:
    • The Tiny Girl to Mr. Peanutbutter and BoJack's Huge Guy.
    • Inverted with her relationship to Wayne since she's a few inches taller than him.
  • Hyper-Competent Sidekick: She becomes this to Flip after he cracks under the pressure of writing Philbert. She takes over and essentially ghostwrites the rest of the first season, and it's implied that her efforts to make Philbert more relatable were a major contributing factor in the show's success. Needless to say the writing of the show takes a major dip after her departure.
  • Hypocrite: In the first episode, she told Bojack you're responsible for your own happiness. When it came to the issue of Sarah Lynn's life, she is quick to pin everything that happened to her on everyone else's shoulder's, particularly Bojack's.

    I-N 
  • Ice Queen: Grows into this after "INT SUB".
  • Iconic Item: Her green jacket. She even wears it over her wedding dress.
  • Ignored Expert: The writer of the Secretariat biography, with experience and enough research to properly capture the race horse's life, Warts and All, is reduced to nothing more than a bystander in The Film of the Book.
  • I Just Want to Be Special: A central part of her character. Despite her constant arguments that she's happy the way she is, a large part of Diane's Character Arc is her desire to leave a mark in the world in a meaningful way, and her increasing sense that she's wasting her life writing typical celebrity bullshit and settling into a marriage because of a fear of independence instead of chasing after what she truly wants.
  • I Let Gwen Stacy Die: The death of Kinko is still hanging heavily over her, as well as the impotence of being unable to stop the continuing massacre.
  • Imaginary Love Triangle: Zig-Zagged. BoJack and Diane's relationship is characterized first and foremost as a professional one, with the occasional chummy moment like the "Stiller" puns based on a magazine in the plane from Boston to Hollywoo or simply talking in an honest matter of fact way about their insecurities and problems. Once she announces her compromise to Mr. Peanutbutter, things start getting a bit awkward around them in spite of their professed camaraderie. Eventually, during a tiny breath in which Diane is interviewing BoJack for the autobiography she's ghostwriting, BoJack (who unbeknownst to Diane was the one who pulled the "D" sign stunt rather than Mr. Peanutbutter) congratulates her over her engagement, as they resume their pun-based comments as a relaxing exercise to resume normal routine. Once asked about what he thinks, BoJack tells Diane that accepting the "D" doesn't sound like a Diane thing, more like a Mr. Peanutbutter thing. Diane, genuinely curious, asks what would be a Diane thing. He simply answers that it would be a more personal gesture like giving her "a collection of photos and e-mails" or "an iPod with her favorite podcasts" or "a practical houseplant". When Diane gently needles him further about it, he tries to dance around the issues by saying she should "be with someone who knows [her]". Diane implicitly asks him "Like who?" as if she's expecting BoJack to tell her how he really feels. Before he can answer, however, the recorder clicks and they both remember they're still in an interview, so BoJack quickly changes the subject.
  • Implied Love Interest: While she and BoJack aren't together by any chance, she's married and there is no overt attraction between them, there's enough subtext, chemistry and Ship Tease for her to qualify for this trope.
  • Important Haircut: After her divorce from Mr. Peanutbutter in season 5, she decides to renew herself by cutting her long hair into more of a bob style. Of course, she doesn't seem to be having much luck playing it as "different" or "important" since she feels just the same.....
  • Ineffectual Loner: Her attacking of Hank Hippopopalous, while well-intentioned, brings her and all of those close to her a lot of bad publicity. Being a small time author with no real fame or people to rely on, she's left with no backup to rely on against all of the threats and hatred from the public and media.
  • Information Wants to Be Free: She tries several methods to expose Hank Hippopopalous's crimes, including Manatee Fair, but the media keeps the story under wraps due to possible bad publicity.
  • Intergenerational Friendship: Eventually develops one with 50-years-old Bojack after some rough patches down the road, bordering on Platonic Life-Partners. She also develops one with a Cordovian little boy named Kinko when she travels there to assist Sebastian St. Claire, which ends tragically when he dies during a bomb attack.
  • Internal Reveal: While clearly suspecting something, Diane was unaware (or unwilling) to see the signs of BoJack's infatuation with her, despite the audience and everyone else seeing it. It's only after he kisses her on the way back from Malibu that she finally realizes it.
  • Interspecies Romance: She (a human) is married to Mr. Peanutbutter (a dog).
  • Intrepid Reporter: She likes to think of herself as this. The realization she's not leads to her becoming a Straw Nihilist. All through the 3rd season, Diane tries to sit out in the benches, attempting to simply conform and be content with what she's got, although judging from the advice BoJack gives her and her joining Girl Croosh, she might once again be ready to give it the old college try.
  • It's All About Me: Her various journalistic crusades and moral high ground misadventures are less about the greater good and more about trying to inject meaning and happiness into her otherwise mundane and meandering life.
  • It's for a Book: Diane is hired by Penguin Publishing to help BoJack finish his biography, since he has let the publication slip without presenting anything. As part of it, she starts following him, interviewing him and hanging around his house in order to write him in the most realistic way.
  • Jerkass Realization: When BoJack mentions how she wrote the book without concern about his privacy, Diane realizes that she never stopped to consider the effect it would have, if she should even do it and that she never really saw anything wrong with it afterwards, despite the signs.
  • Jerk with a Heart of Gold: Normally a Nice Girl, Diane isn't someone you would completely trust or like either when she'd become sufficiently convinced that something deserves her undivided attention. She's had more than enough selfish moments, including sinking to near-BoJack levels of jerkassery (hence why they can sympathize so well with one another): often being annoyed enough with her husband to ignore him or simply sidetrack anything involving him in some capacity if it hinders her, fighting with people who have been nothing but accommodating to her because they stand against what she believes in, the list goes on. But likewise, she's not a bad person herself and can pedal back a bit if she goes too far.
  • Karma Houdini Warranty: During season 1, Diane was sympathetic enough for her actions be if not justified then understandable; that being said, she still suckered BoJack into revealing his deepest secrets all the while being the closest thing he's had to a friend in a while and then promptly revealed it as a sneak peek in a vicious spite that not only breached his confidence but also ensured to discuss topics concerning no one's business. Not to say that her POV narration switched from a neutral standpoint to her perception of BoJack, even with a condescending tone. During season 2, she's downgraded in the Hollywoo totem pole to just a glorified "consultant" and misses her one task (checking no one trips on a cable in the Secretariat set) which causes someone to burn her face with coffee and almost gets her fired. Later, when she tries to stand against Hank Hippopopalous in favor of abused women who she paid no heed in the first place other than out of wounded pride, she's rebuffed in every way possible and gets sent death threats. And the two people she can rely on, BoJack and Mr. Peanutbutter, refuse to support her because they do have personal stakes in the matter and are not happy with the way she's been treating them. Even after getting (begrudgingly) BoJack's support, she still loses. And then there's the matter of Cordovia....talk about overkill.
  • Keeping Secrets Sucks: Time and time again, Diane has kept secrets from Mr. Peanutbutter regarding her location, how she truly feels, what is she doing, who is she doing it with, etc. and every time it has only created a bigger rift between them. With her current employment at Girl Croosh, Diane is trying to be coy about a certain "no-forbidden-attacks" policy to Mr. Peanutbutter, especially with his upcoming presidential campaign on the horizon. Ultimately, she does end writing a few backlash articles toward his campaign, but it never goes that far and when it does, it becomes a sort of Slap-Slap-Kiss dynamic while remaining in conflict when in public.
  • Kindness Button: Despite her growing cynicism, Diane's softer, more caring side can still show in certain situations:
    • Listening to her reasons for doing things as well as her pain is a sure way to earn a nod from her at worst; if it's as an actual emotional connection, she'll give the most genuine smile you'll ever see.
    • Seeing people in pain or oppressed will put her in action to comfort and ensure their safety.
    • If you have been abused or have had a difficult upbringing, Diane will listen. If you actually request her help, she'll do it.
  • Lady Swears-a-Lot: Diane didn't use profanity as much as BoJack but throughout the seasons she became more frequent to the point that she was the first main character to use the f-word out of anger.
  • Lame Comeback: Once Princess Carolyn asks why is she staying with BoJack when everybody believed her to be in Cordovia.
    Idea for a thing Princess Carolyn should do: shut up.
  • Lame Excuse: When trying to justify her actions from "The Shot" up to "Out To Sea" toward Princess Carolyn and later to Mr. Peanutbutter, this is all she can come up with: telling PC to shut up and PB that she's talking to a a refugee (and then, imitating a refugee's voice to keep the charade going.)
  • Light Feminine and Dark Feminine: The Light Feminine to Princess Carolyn's Dark Feminine.
  • Living Emotional Crutch: For more than one person and for some of the same reasons.
    • Somewhat for BoJack. Being around her does make him confront his past more head on and come to some realizations about himself.
    • In the first season, it's hinted that she's also this to Mr. Peanutbutter. Confirmed in the second season, when Mr. Peanutbutter reveals that when she leaves for the day, he mostly just sits on the couch, listless. By season 4, this has led Diane to her breaking point and so they quietly burn the bridges.
  • Living Is More Than Surviving: Not said word by word, but it's clear that she means this when talking to Mr. Peanutbutter about their state of their marriage and how unhappy it's making her in "After The Party": they have become stuck into a routine with no challenges or changes and while that may be okay for him, it's not okay for Diane. She wants to do something else, something meaningful and she feels that working with Sebastian St. Claire might be providing that opportunity.
  • Locked Out of the Loop: 3 seasons in and Diane might be the only one of the group (besides possibly Todd) to not known that the stolen "D" from the Hollywoo(d) sign was a romantic gesture from BoJack, not Mr. Peanutbutter.
  • Loner-Turned-Friend: A twofer example in her relationship with BoJack, since while they have companions and contacts, neither of them has true friends in Hollywoo. Well, except Todd but that's not saying much.
  • Loony Friends Improve Your Personality: Rare Female Example. Diane has always been introverted and distantly friendly, which has drawn her to Mr. Peanutbutter, due to being her polar opposite. As far as friends are concerned, BoJack is the only one she has in Hollywoo, (well besides Roxy and Wayne, but she hardly frequents them anymore) and their mutual problems and discussion about them have gone a long way in helping her overcome those problems. So has her interactions with Princess Carolyn in a professional sense especially in coming to terms with the craft of Hollywoo and Todd in the sense of accepting her more relaxed side and willing to simply let the dice roll. The thing is unlike PB, Diane has goals beyond just being comfortable with what she's got and is often exasperated by the lengths he goes to express his love for her, leading to often try to do activities just involving herself to keep her individuality; as for BoJack, his extreme cynicism has made Diane fearful of what she might become if she gives in to much weariness or too much work with no life outside of it, yet their mutual similarities have become more pronounced; Princess Carolyn's advice has led her to become more comfortable, pragmatic and willing to stretch her moral ethics through the murky workplace of L.A. and Todd in a way has influenced her to take things more slowly, sometimes to the point of becoming a passive participant in situations which could use some of her experience. What reconstructs this trope is that give or take these downfalls, Diane has developed into a more assertive person, for better or worse.
  • Loose Lips: How BoJack starts seeing her in light of her biography about him revealing all sorts of embarrassing secrets, to the point of carefully not telling her certain information out of fear. It takes her apologizing for BoJack to completely regain his trust on her.
  • Lovable Nerd: Often does a lot of research involving her books and has deep knowledge about a wide range of topics, but she's far from gawky and has quite a lot of quirky and endearing traits.
  • Love Cannot Overcome: As much as they've tried over the first 3 seasons and even with a few Hope Spots in season 4, Diane and Mr. Peanutbutter have in his words "become roommates" rather than wife and husband. Despite their attempts in the season 4 finale and love for each other, they finally explode toward each other and their situation at the end indicates they know what's about to come.
  • Love Triangle: Between BoJack, Diane, and Mr. Peanutbutter, especially in Season 1. Downplayed in Season 2, at least until "Let's Find Out."
  • The Maiden Name Debate: She kept her original surname after marrying Mr. Peanutbutter.
  • Mainstream Obscurity: In-Universe. She's a writer, best known for having written the definite Secretariat biography, and Mr. Peanutbutter's girlfriend (and later wife), but because of her low-key and humble personality, her work is relatively unknown around Hollywoo outside of intellectual circles.
  • Malicious Slander: This starts hitting Diane as soon as she starts digging deep into the accusations against Uncle Hankie and proclaiming the truth at every interview, with threats being sent through the mail, Hollywoo downplaying Hippopopalous' actions and condemning Diane for being a complainer and defamatory; not to say of the overwhelming hate of the public throwing insults and dismissals of her intentions.
  • Masculine Girl, Feminine Boy: The Masculine Girl to Mr. Peanutbutter's Feminine Boy.
  • Maternally Challenged: Averted. She can be awkward with children and teenagers, but she's overall a good role model, if a bit dull. She just doesn't want to have any children herself.
  • Meet Cute: Twice with Mr. Peanutbutter.
    • The first time was at a Starbucks when Mr. Peanutbutter and his second wife Jessica Biel go for a coffee. Diane is going for the fake name "Blarg", something that Mr. Peanutbutter takes seriously causing her to laugh.
    • The second was visiting him backstage after he had broken up with Jessica and they both talk. Diane finds refreshing the fact that Mr. Peanutbutter pays attention to her opinions and desires without mocking them and he finds great how nonjudgmental she is about his quirks and dim nature. Then, Mr. Peanutbutter takes off his shirt to the delight of Diane. From then on it's all history.
  • Meganekko: Needless to say, part of her image are her squared glasses, which tie in nicely with her professional attitude and Adorkable personality, as well as her mostly reserved attitude.
  • Modern Major General: Diane, a person better suited to be a consultant, is assigned the watch of a cable on the set, something for which she's overqualified to do. For added irony, she accidentally screws up this one job.
  • Morality Pet: Of the entire cast, Diane is the sole person that Bojack is the nicest to.
  • Most Writers Are Human: While she's not the only writer, she's one of the main characters and one of the only human characters, besides Todd, in the main cast.
  • Most Writers Are Male: Gender Flipped and played with. She's not the only writer in Hollywoo, but she's the most featured and besides her ex, Wayne; one of the few writers with a sense of moral.
  • Most Writers Are Writers: Pretty self-explanatory at this point, but In-Universe, Diane is an acclaimed non-fiction writer.
  • Ms. Vice Girl: Being the most moral and good natured character out of the main five, Diane still possesses some flaws like often letting her continuous search for the truth get the best out of her without taking into account people's feelings, privacy or even opinion on the matter or allowing it to consume her whole attention. Not to say about her constant depression and avoidance of certain horrible truths. Nevertheless, these do not detract from her sympathetic persona.
  • Muggle Best Friend: Downplayed. Diane's best friends with BoJack, Princess Carolyn and is married to Mr. Peanutbutter. While she's certainly not unknown in Hollywoo (she is still an accomplished writer and has worked with VIM as a social media manager), the rest of the group are celebrities in ways more important to Hollywoo culture. This is especially true of her relationship with the horse, even if it's evened out by his nonexistent accomplishments in the present. Inverted regarding Todd, Wayne and Roxy, since she's by comparison more notorious.
  • Multi-Ethnic Name: Her surname is Nguyen, of Vietnamese roots, while the first one is American.
  • The Missus and the Ex: She reluctantly interacts with Wayne, her ex, while he's working on a Buzzfeed article on her then-boyfriend, Mr. Peanutbutter. Subverted later when they simply able to work together on other ventures like a sneak peek of Bojack's book and a proposed article on Hank Hippopopalous.
  • Named After Someone Famous: While bonding with Kinko, Diane mentions that her name means "my parents used to enjoy watching Cheers".
  • The Needs of the Many: Her realization that she can't handle such responsibility, as well as her war-riddled environment causes her Despair Event Horizon.
  • Nerd Glasses: Being a Hollywood Nerd, she certainly has ones, although it's downplayed since she's more of an intellectual.
  • Nerds Are Sexy: She's quite good-looking.
  • Neutral Female: She starts as one at the beginning of the series, before subverting in more and more awesome ways as she develops.
  • Never Live It Down: In-Universe. No one in the Secretariat crew lets her forget that her mistake caused Debra's face to be burned, despite being an unlikely, one-in-a-lifetime accident. In a variation, they never said it to her face, although Kelsey looks at her disapprovingly and Turtletaub indirectly chastises for getting distracted by making her put a sign that warns people of the cable, since "it's more likely to not get distracted".
  • Nice Girl: She's never completely mean to anyone and is one of the few, besides Todd, to show any genuine sympathy towards Bojack, although she's more than willing to call him out if needed. Although this can be downplayed when personal issues, ideals and self-importance comes to the front. See Jerk with a Heart of Gold above.
  • No Accounting for Taste: Diane's entire relationship with Mr. Peanutbutter on a nutshell. It's Played With sometimes as she's not without flaws that cause Mr. Peanutbutter grief and problems or moments where they truly love each other, but it's still a marriage of an intelligent woman with The Ditz. Several characters, including Bojack, Wayne and even Mr. Peanutbutter have lampshaded it.
  • Nobody Calls Me "Chicken"!: Part of what propels Diane to take action about the chicken's possible future after they leave it in Gentle Farms is Irving's comments about how little does she care about the matter, which is why she doesn't do anything else beside the minimum. Up until then, she seemed okay with justifying the decision of settling Becka in a similar environment from which the chicken escaped. Afterwards? She drives back where they dropped her off, consequences and danger be damned.
  • No Fame, No Wealth, No Service: Diane always wants to make a difference, but as she finds time and time again, nobody in Hollywoo's going to pay heed, follow the lead or offer a chance and a good position to a relatively unknown writer who's barely noticed at all. Despite being the author of the acclaimed Secretariat biography and being knowledgeable of Hollywoo's celebrities' dirty blankets, in the movie she's reduced to being nothing more than an errand boy for the director without any saying on the finale product and her expertise and research on the topic of hush-hush scandals ends up being derailed and undermined by the public, the media and everyone the moment she tries to lock horns against Hank Hippopopalous for being an implied woman abuser. As she comes to the realization and Hank tells her himself: She, being an individual without connections or fame to rely on, can't decide and doesn't matter in the grand scheme of things or the agenda of Hollywoo.
  • "No. Just... No" Reaction: Diane's response to BoJack's question if he's a good person. More impressing of all, she doesn't even have to utter a word.
  • No Mere Windmill: Invoked Trope in "Hank After Dark". Diane's allegations and reports against Hank are sound and clear about how much damage the superstar has caused to her secretaries, how the dismissal of such claims is banal and sexist and how by covering up Hollywoo is not only ensuring that a Serial Rapist pulls a Karma Houdini, but how much is the city willing to sacrifice for the sake of keeping a money-generating celebrity at the cost of women rights, let alone basic human rights. The people who are attacking her are either going into full blown denial, Believing Their Own Lies or part of the problem and (understandably) deliberately playing down the threat and/or dismissing Diane as crazy in order to deflect attention away from themselves to keep the farce going.
  • The Nondescript: Invoked by herself, of all people. Being a pretty meekly person herself, Diane has always felt uncomfortable when having to deal with multitudes or social gatherings. Therefore, she has made a priority to never be the center of attention, always scooting by when in big parties, tries to avoid interacting with everyone, not be noticed at all and is reasonably upset when a reality TV camera crew is filming in her house and invading her personal space. Out of sight, out of mind, as long as she's easily forgettable and doesn't leave a mark, it's okay for her. Nobody remembers her, she is no one of importance, end of story. Unfortunately, as "Hank After Dark" shows, staying out of the spotlight and remaining there means that whenever you want to make an actually important point to the general public, your lack of reputation may be a hindrance rather than helpful.
  • The Not-Love Interest: Outside of BoJack, she is perhaps the most developed character in the series. Of course, the "Not" part can be debatable, what with some Ship Tease between the two here and there.
  • Note to Self: In "Out To Sea", she ends up carrying a tape recorder around to keep track of the ideas she has for inventions: a new proposal for a Pixar movie and an undo app that could reverse time and erase mistakes made by the person: Three months. A year. A life. Played for Drama, of course, since she's trying to keep her head busy with stupid and trivial things to avoid thinking too much about what happened or how shitty she feels about everything.
  • Not So Above It All: She has moments of selfishness and even craziness, as well. Especially when it comes to comparisons between her and BoJack.
  • Nurse with Good Intentions: Played With in her interactions with Kinko during "The Shot". Diane wants to inspire hope within him that he can achieve great things once he survives the war and gets out of Cordovia, but can't help but curb his enthusiasm into more realistic goals ("I mean, not everyone gets to write for The New Yorker...") and it usually causes her to forget (unfortunately for her) the real reason why she's here in the first place: to be a shill for Sebastian St. Claire rather than provide any comfort for survivors, something she'd rather be doing.

    O-T 
  • Oblivious Guilt Slinging: Played With during season 2. Mr. Peanutbutter's offhanded comments to Diane about how he loves spending time with her were calculated efforts to subtly push her into not going overseas with Sebastian St. Claire. Every bit of praise after she goes abroad falls solidly into this trope.
  • Odd Couple: With Mr. Peanutbutter. She's intelligent, cynical and somewhat concerned about ideals. He's ditzy, optimistic (somewhat) and an Anti-Nihilist. While they love each other, the show doesn't pull away from showing how their stark differences often lead them into conflict.
  • Older Hero vs. Younger Villain: Inverted, with Diane being The Young Hero to Hank Hippopopalous's Old Villain.
  • Older Than She Looks: She's 35, but looks about a decade younger.
  • Only Friend: For BoJack, since she's the only one of the core five that can get him to open up and be more honest, as well as his most trusted companion. Employed subtly is the fact that BoJack's also one for Diane, since besides Mr. Peanutbutter, she doesn't really know anyone else in Hollywoo.
    • The episode "The Stopped Show" reveals that in high school she had only one friend named Abby who then turned on her after joining the cool kids. However, Diane was still there for her after her mom got sick even though she hated her at that point which Diane later uses to show why she's still helping BoJack with his problems even after learning his darkest secrets and pretty much hating him as a result.
  • Only Sane Woman: Deconstructed. Diane is this out of the main cast and is certainly the most level-headed out of them. But she's far from perfect with a lot of neuroses and flaws that only shine through when she's around other, more well balanced people.
  • Only Sane Employee: During her brief stint at VIM in season 3. She's the only one who's allowed to (badly) do her job since Princess Carolyn seems to be the one who does most of the work by herself and protests about the shameless way PC and Sextina are using the abortion scandal.
  • On the Rebound: Fresh off divorcing Mr. Peanutbutter, Diane and BoJack are back to hanging out together....until Diane makes the awkward suggestion that she's single again, they could try, y'know, making out. While it's left ambiguous whether or not her and BJ's feelings on the matter, the latter suspects Diane is overcompensating because of the divorce and just wants to have someone by her side. Later, Diane admits to him that what she needs the most right now is a friend, not a lover.
  • Opposites Attract: It's hard to say exactly what made Diane meet and fall in love with Mr. Peanutbutter, but they did and in an odd way, they do compliment each other. That being said, they may be slowly developing divergent agendas..
  • Outnumbered Sibling: She's the only female out of her brothers and one of the only two females in her family.
  • Overshadowed by Controversy: An in-universe example. Despite Princess Carolyn's warnings, Diane ends up derailing the "One Trick Pony" book tour by igniting a debate over another one of Hollywoo's decadent celebrities: Hank Hippopopalous, when she mentions him as being worse than BoJack. As the dates and stops continue, more and more people argue with Diane over it, making the argument escalate and grow until it overtakes the promotion of the book, and eventually the book altogether.
  • Pajama-Clad Hero: During her drunken bender down at BoJack's, the only garments Diane uses during her whole two months stay are a stained bathrobe, a sleeping blouse and pants, as a sign of her emotional decline.
  • Patrick Stewart Speech: Directed to one individual, none other. As BoJack stands outside "Pastiches", the rehabilitation center, he simply asks Diane why, after all he has done to her, she's still helping him. Diane simply responds by telling a story about her friend back in high school, Abby, and how she fell with the cool people and turned on her, using everything they had shared as friends against her. But then, her mother got sick, all her so-called friends left on spring break and she was there for her.
    BoJack: Why?
    Diane: Because I'm an idiot. And it was Abby. And I hated her, and I will never forgive her, but she needed me and she was my best friend and I loved her. And now you're here, and I hate you, but you're my best friend, and you need me.
  • Petite Pride: Averted. See A-Cup Angst above.
  • Platonic Life-Partners: With BoJack. It only becomes more evident in season 2, when Diane stays at Bojack's, having nowhere to go after bailing out on Sebastian St. Clair.
  • Post-Kiss Catatonia: After BoJack kisses her after their trip to Herb in "The Telescope", Diane simply stares uncomfortably at him and then gets back in the car, crushing BoJack's expectations of a relationship.
  • Prank Date: A horrifying take on it; in "Live Fast, Diane Nguyen", it's revealed that when Diane was young, she had a pen-pal named Leo, created by her brothers to mess up with her. Then, when they were supposed to meet for prom night, Diane's brothers hired a homeless man to pose as Leo. Diane was devastated, to say the least, as shown by the video her brothers took of the moment.
  • Protectorate: For Mr. Peanutbutter. Diane really wishes that wasn't the case, since she often feels overwhelmed with exaggerated attention from his part.
  • Pyrrhic Victory: While their intervention manages to spare "Becka" from an assured death, there's not really that much of a change; Diane, Todd and Irving's actions have done nothing but save one's life and the cycle of death and cannibalism continues...
  • Raised by Dudes: Sure, her mother had a certain part in her upbringing, but Diane's childhood was spent at the service and mercy of her 4 brothers and very old-fashioned dad. As such, their impact on her and her development was pretty much influenced in both good and bad ways: for one, her victimization at their hands has made her a pretty reclusive, quiet person with a desire to make a change in society; on the other side, their manly attitude bordering on Anti-Intellectualism has rubbed on her. She clearly loves reading, books and information precisely for the same reasons they loathe them, yet Pride and Chronic Backstabbing Disorder rear their ugly heads over and over, with her ironically hot-headedness, dressing code bordering on tomboy, uninterested on female behavior proportionately inverse to female ideals and haughty reasoning clearly traits inherited by her in part due to her family, for several reasons.
  • Rage Breaking Point: Reaches it in 'Live Fast, Diane Nguyen' after her family treat her like crap all day and Bojack tries to help.
    BoJack: Guys, you got it all wrong. Diane isn't a big shot. She's my ghostwriter. She's writing a book that's not even gonna have her name on it. You think this how she expected this is how her life would be going at 34? She lives with her rich boyfriend and doesn't pay rent. She's not too good for anything!
    Diane's Brother: What? Diane's a freeloader? Even I pay rent! (Her brother's all start to laugh)
    BoJack: (gives thumbs up) BoJack helping?
    Diane: GrrrRRRAUGH! (starts smashing beer bottles) THIS IS WHY I TOLD YOU TO WAIT IN THE CAR!
    • In "Hank After Dark", she is completely willing to drop the Hank issue until a misogynist starts Slut-Shaming the assistants and accuses them of just trying to ruin his life.
    • In "What Time Is It Right Now?" she finally snaps at Mr. Peanutbutter after he tries a Grand Romantic Gesture of giving her a library like the one Belle had. It was right then that she finally got fed up with how he never listened to her, or only insisted on trying to make her happy the way he would like to be. The conversation after she calms down heavily implies that their marriage won't last much longer.
  • "The Reason You Suck" Speech: Once she has had enough of BoJack telling her off in "It's You", Diane tells him exactly how his current situation is going and almost ends up:
    Diane: You know what's gonna happen? You're gonna win that Oscar, and you're gonna go up on that stage and give your little speech, and then you're gonna go home. And you're gonna be so miserable, you'll want to kill yourself. And you're gonna have nobody left to stop you.
  • The Reliable One: Responsible to a fault in every sense. That being said, this can often be inverted when she's affected emotionally or is simply too invested in what's happening in which case her help becomes a liability.
  • Rock Bottom: Two times- After failing to bring Hank to justice and being unable to cope with Cordovia's situation.
  • Savvy Guy, Energetic Girl: Gender Flipped example, with quiet, meek but firm Diane being The Savvy Gal married to the excited, happy-go-lucky Mr. Peanutbutter, The Energetic Guy.
  • Second Love: To Mr. Peanutbutter. He was married twice before they met, both marriages ending in divorce.
  • Secret Admirer: A Puppy Love version with her childhood pen-pal friend, Leo or at least that's what she thought. It turns out it was a mean spirited prank from her brothers.
  • Secret Keeper: BoJack sees her as such, until "One Trick Pony" hits libraries.
  • Seduction-Proof Marriage: While they weren't married yet, Diane shows quite a lot of restrain and dedication in rebuffing BoJack's advances towards her while she's in a relationship with Mr. Peanutbutter. Especially when her engagement is on the horizon. She even brings this up in regards of Mr. Peanutbutter's fear that she might be swept to Sebastian St. Claire's charms. Of course, seduction might not be the thing that will break up their marriage...
  • Seeking Sanctuary: After doing an unexpectedly early return from Cordovia and facing the choice of heading home and accepting defeat and even confronting Mr. Peanutbutter over abandonment and mutual disillusionment or simply staying and enduring multiple atrocities in a heartless country with a host who won't stand for weaknesses, she heads down to BoJack's and asks if she can stay with him meanwhile. That she went to him rather than Roxy or Wayne for help makes Roxy a bit suspicious...
  • Selective Obliviousness: Criticizes this aspect the most about the Hank Hippopopalous case, saying that as beloved as some famous celebrity can be, that's no excuse to not hold him accountable for his actions to the point of ignoring them or trying to justify them, since it shows an undeclared case of Double Standard. It finally reaches its peak during an MSNBSea interview, when confronted with a Female Misogynist:
    Diane: That's exactly the problem. Because he's so nice, people don't want to think he's capable of awful things so they let him off the hook.
  • Seriously Scruffy: She seriously lets herself go after returning from Cordovia. She eats without any regard whatever she can find, reuses the same pair of clothes she packed over and over again, doesn't bathe and has messy hair and frequently takes naps near the pool or just whenever her body falls.
  • Sexless Marriage: By season 4, this is what Diane's marriage to Mr. Peanutbutter has become. The beginning of "Commence Fracking" features them in bed trying to achieve an orgasm only to quit when it's clear Mr. Peanutbutter can't perform due to anxiety. They briefly re-experience an igniting passion when they, on opposing sides of the political spectrum due to their jobs, constantly have sex after arguing only to backtrack when one of Mr. Peanutbutter's decisions leads to the fundraiser held at their house to collapse underground. Afterwards and with all governor's business said and done, even the romance starts faltering until it extinguishes at the end of the season.
  • The Shrink: A mixture of Type 2 and Type 3 for BoJack. As he starts opening to her, Diane helps through advice and similar experience, empathizing with him through it all, with BoJack even reciprocating and giving her tips and motivation to keep moving. It's telling that even when they're both at their lowest, the advice they give each other, especially Diane to BoJack, helps both of them in often unexpected ways. Of course, Diane's advice can also be hit-or-miss as well since she's often as lost as the horse and often leads to some rather dire circumstances when she's not terribly self-aware of the context.
  • Shrinking Violet: At first, she tries to avoid overstepping boundaries, often struggles to find the correct thing to say, apologizes even through she doesn't need to and often avoids large crowds and parties to not get embarrassed. She has started getting better as the series continues.
  • Shoot the Messenger: Played with; it never goes as far as "actually" shoot her, but short of that, Diane's comments about Hank do end up provoking the wrath of both audiences and media, which proceed to do everything to bash her personally and professionally.
  • The Short Guy with Glasses: Even Princess Carolyn towers over her. Although, to be fair, she's taller than Todd.
  • Shy Blue-Haired Girl: Hard to tell if it's really blue, but she's mostly a meek, Adorkable person with a dark shade of blue hair, uncomfortable with a lot of people and prefers to remain with the traditional.
  • Single Woman Seeks Good Man: One of Diane's constant in life has been her search for love and what kind of man or animal would fit into her dream version of the ideal boyfriend, especially when one or two flaws would start making them drift apart:
    • Diane reflects, once she returns from Cordovia, that she likes this attitude most from Mr. Peanutbutter. She shows up with a thousand thoughts and worries on her head and Mr. Peanutbutter will say something that cheers her up, even if it's something stupid. He won't even care that she failed, loving her all the same.
      Diane: (to Wayne) Mr. Peanutbutter is nice to me. He's kind, and he's generous, and he's loyal.
    • She also liked her ex-boyfriend, Wayne, because he was "smart and funny and sophisticated and cool", but broke up with him because of how "mean" he could be due to his extreme cynicism on life and people.
    • What keeps her linked to BoJack besides being a closet fan of Horsin' Around is that she's close enough to see beyond the layers of jerkassery he puts and get a glimpse of his sophisticated, warm, hidden nature.
  • Slowly Slipping Into Evil: Not "amoral, machiavellian" evil as one would think; rather, the "cold, systematically pragmatic, "'will this hurt me'" evil, even if there's still shreds of individuality and goodness even in her controlled rebellious attitude. Not same, but eerily with the same effect, as Diane attempts to balance her ideals with their functionality within her environment (Hollywoo) with each passing (and disastrous) failure making her compromise more and more of her values and morality to avoid rocking the boat too much.
  • Small Name, Big Ego: Despite her desire to make a change and being more often than not for good reasons, Diane gets the wrong idea that her opinion and the fact that she's right alone is enough for people to listen to her regardless of how truly influential she is or how much it can be in other people's interests not to. She's had to learn this in the most painful ways.
  • Smart People Wear Glasses: An intellectual Vietnamese-American woman with quite good looks who uses glasses. She's also one of the more level-headed members of the main cast.
  • Snipe Hunt: What does Diane, writer of the Secretariat biography, get as a job in the set for The Movie? Watching a cable so no one trips over it. When she stops doing so in frustration, that's when someone actually does trip over it.
  • Soapbox Sadie: Despite her generally introverted personality, she'll push hard for worthy causes. Sadly, as the series moves forward, this is presented as not always being a good thing, as Diane hasn't yet realized the difference between "supporting" and "being part of it".
    • Season 2, in particular, presents two instances where this is deconstructed - first, when she's trying to bring attention to Hank Hippopolous' crimes, she gets nothing but vitriol for smearing a beloved figure, and is finally asked by Mr. Peanutbutter (who'd been reading the various death threats sent to her by mail) why she has to be the one fighting for it when she has no personal stake. The second is when she travels to war-torn Cordovia to "make a difference", but is completely overwhelmed by the aftermath of the refugee camp getting hit with a bomb, going home in disgrace because she couldn't "walk the walk".
  • The Shut-In: After disowning Bojack for good and leaving Philbert, Diane becomes this in the last few episodes of season 5.
  • Strange Minds Think Alike: With BoJack.
  • Straw Feminist: Zig-zagged a bunch and often Played for Laughs, but ultimately a deconstruction. While Diane is a proud feminist and a staunch advocate for social equality, she bears no ill will towards men and harbors no spite or prejudice towards any of the male characters, and she has plenty of other interests and hobbies that she enjoys other than advocating social justice. This, however, is not how the public perceives her, due to the fact that her stubbornness and self-righteousness showcase her as an angry, ranting Straw Feminist on MSNBSea whenever she tries to raise awareness to otherwise good talking points that have actual merit when discussing social issues in the US and is met with resistance, such as when she tried to expose Hank Hippopopalous and the various times he sexually harassed his assistants. In Season 4, she begins working for a feminist blog and is initially discouraged by the fact that no one wants to read her serious articles on social issues, to the point where she has to resort to writing clickbait articles with actual, serious discussion woven in just to get people to read her work. As Mr. Peanutbutter starts to support controversial stances on issues such as fracking and gun control, Diane publicly defies him by writing these articles targeted at him, and even arguing with him directly on the news, once again showing her self-righteous, argumentative side when she tries to explain the benefits of gun ownership, particularly for women. When a female mass-shooter causes an uproar in the media, she fights for the right to gun ownership when California legislators start drafting gun control bills, but only after a female mass-shooter attacks following several attacks from male shooters. Instead of listening to her words and addressing the cultural problems that lead to women wanting to own guns in the first place, the male lawmakers decide to instead ban all guns in the state of California.
    Princess Caroline: Wow, Diane! You just passed sensible gun legislation.
    Diane: I can't believe this country hates women more than it loves guns.
  • Straw Nihilist: She slides into this after returning from the war environment, believing everything to be a lie and worthless. Her attitude leads BoJack and Wanda to have a spat and, ultimately, to break up.
  • Strictly Professional Relationship: She tries to use this approach when it comes to subjects in her books, especially when it comes to ghostwriting BoJack's biography. However, they eventually become friends and this trope starts to be played with, especially when the horse falls in love with her and she has to draw a line; the conflict worsens when the biography hits the bookstores and reveals some unsavory parts of BoJack, damaging their friendship.
    • Although they manage to repair it in season 2 and 3, going back and forth between working well together and understanding each other against feeding off their mutual neuroses and pushing each other to their limits, Diane tries to step her foot down in "BoJack Kills" and distance herself from him by keeping everything professional between them. Then again, it doesn't take since they have to carpool together for the early Oscar campaign and then, team up for a murder mystery and get along with each other. Diane eventually admits that it's not that she doesn't want to remain friends, she's just ashamed of who she was while staying in BoJack's house.
  • Summon Everyman Hero: Deconstructed. In the 1st season finale "Later", Diane receives a call from Sebastian St. Claire, a Wealthy Philanthropist who's read her book and wants to hire her as his biographer during his work at Cordovia, a ravaged third world country. Even after delaying going, she desperately wants to go despite the risks since she feels that being in such an important task makes her feel that she's part of a bigger purpose and is actually helping people, unlike Hollywoo where she seems to be stuck in a rut and is an easily missed dot. As it turns out, despite her genuine desire to help and be at the service of such a cause, Diane discovers that she's woefully unprepared for the piss poor level conditions of the country, as well as the necessary detachment one has to have when dealing with refugees who can die at any second, be it young, old or actual children. What ultimately destroys any desire of hers to keep fighting is that the subject of her book is more concerned with raising money for any of his charities and feed his ego rather than spreading word of the actual deplorable state of Cordovia and its inhabitants' need for help as she had first assumed.
  • Suppressed Rage: As BoJack comments, she often seems to try to remain calm even when the healthiest thing to do would be blow some steam. This causes her Rage Breaking Point above.
  • Surrounded by Idiots: Believes herself to be smarter and wiser than everybody around her only for her paradoxically small-minded presumptions to be outed every other episode.
  • Tank-Top Tomboy: Downplayed. Diane's not overtly masculine, but does have some gender neutral interests and little stereotypical feminine traits.
  • They Just Don't Get It: Implied to have realized this about Mr. Peanutbutter after a talk with Stefani Stilton. Whether this lead her to take the job in Girl Croosh or not is left up in the air.
  • Token Human: Along with Todd, she's one of the few non-animals in the cast.
  • Tomboy and Girly Girl: The Tomboy to Princess Carolyn's Girly Girl. Only in appearance however, since Diane is far more involved in feminine traits and goals than PC.
  • Tomboy with a Girly Streak: She mostly dresses in pants and blouse, has no interest in stereotypical female interests, hates and doesn't do housework, preferring to write; yet still is involved heavily on Feminism and within the women of the group, Diane has the more sensitive traits, by comparison to Princess Carolyn.
  • Took a Level in Cynic: By the end of season 2, it's clear that she has become more jaded about her capability on leaving an impact on the world as she had first assumed.
  • Took a Level in Jerkass: While not a drastic change, Diane was clearly more meek and sweet-natured in the first season. Her more self-centered and stubborn sides become clearer with the seasons, but she's still a Nice Girl for the most part.
  • Triang Relations: A major plot line is the evolution of Diane's relationship with BoJack and Mr. Peanutbutter, including how they perceive it to be and how it really is.
    • It starts as a typical example of Type 12: BoJack falls in love with Diane, who's in a committed relationship with his rival, Mr. Peanutbutter—who, for his part, genuinely likes BoJack and is always trying to become his friend, despite the constant rejection.
    • Then, it moves into a bizarre mixture of Type 2, Type 3 and Type 4 when they start working together: Diane's focused on BoJack, whose interest for her is growing, yet only for his biography and is truly in love with Mr. Peanutbutter, who yearns to be BoJack's friend much to the latter's displeasure and annoyance. At the same time, as feelings start coming to the upfront, both the horse and the labrador end up in the same running path to win Diane's heart, putting them in conflict as rivals, all while Diane remains oblivious for the most part, especially regarding BoJack's real feelings.
    • AND THEN it gets really weird. Type 7 creeps in, thanks to BoJack starting to make actual efforts to win Diane over, while Diane remains devoted to Mr. Peanutbutter while at the same time seeing her relationship with BoJack grow as a strong bond of friendship. Followed very swiftly by Type 8 when both of her suitors's relationship evolves from a one-sided friendship to a two-sided rivalry to a reluctant partnership, complete with uneasy civil treatment.
    • Meanwhile, from Diane's point of view, it's more of a Type 10 with a more platonic edge: she's in a committed relationship but has feelings for BoJack in a way (sort of). As if it wasn't complicated enough, PB and BoJack's evolving interactions result in a slow slide into Type 11, with Mr. Peanutbutter's desire of BoJack's friendship turning out to have some possible romantic undertones as well.
  • True Love Is Boring: As the 2nd season progresses and their marriage continues, Diane eventually starts to question her relationship with Mr. Peanutbutter, since as a couple, both of them start to settle into a never-changing, predictable routine with no surprise, no possibilities of individual goals and actual complacency towards every single action they make. It's telling that she becomes anxious when Kelsey gives her the "people stop growing at a point" speech, since unlike her husband, Diane's unhappiness at their situation and depression over the inability to completely escape it only continue growing, while at the same time conflicted over whether this also is affecting Mr. Peanutbutter, whom she truly loves.
  • True Love Is Exceptional: A Badass Bookworm with Enlightened Self-Interest ended up falling for and marrying a Cloudcuckoolander Anti-Nihilist Genki Guy. Deconstructed over time; she's drifting away to search what she wants and he's slowly becoming disillusioned with their relationship.

    U-Z 
  • Undying Loyalty: To BoJack. These two are extremely loyal, compassionate and understanding to each other, making them such an inseparable pair. They even share free insightful advice and their own feelings.
    • Season 5 downplays this by showing that while Diane does legitimately care for Bojack, she has her limits and can lash our against him when he crosses the line. Still, she is ultimately the person who finally convinces Bojack to seek profession help and even opts to drive him to the rehab center herself.
  • The Unfavorite: She has a lot of hard-drinking Bostonian brothers who do absolutely nothing with their lives, and yet Diane is still the one their mother criticizes the most. It seems to stem from their mother's belief that anything out of Hollywoo is toxic. She's not entirely incorrect about that, but Diane's attempts to improve herself and have her family tell her that they're proud of her is baffling to BoJack since they never give her even the slightest bit of encouragement.
  • Unfazed Everyman: Despite being an Audience Surrogate in the way of Hollywoo epic scale eccentricities, Diane is otherwise calm and straight-faced in absurd situations like a lemur catching on fire in "Prickly Muffin" or the fact that she's dating an anthropomorphic Labrador. Varying from episode to episode go from a selective Weirdness Censor or a harsh case of Scully Syndrome.
  • The Unapologetic: Why BoJack is still resented with her and why he won't support her at first with the Hank Hippopopalous case. She hasn't apologized over hurting his feelings by publishing "One Trick Pony". Immediately subverted when she realizes this and quickly apologizes.
  • Unequal Pairing: And not a one-sided example at that. Diane, whom Mr. Peanutbutter sees as miles above his I.Q. as well as far more savvy in every sense, marries Mr. Peanutbutter, whom Diane sees as a famous superstar with actual income and a house of his own.
  • The Unpronounceable: Downplayed—"Nguyen" isn't that difficult to pronounce, as Mr. Peanutbutter demonstrates, but BoJack and other members of Hollywoo find it challenging. Usually the problem is they've never heard it spoken out loud; the spelling isn't phonetic.
    • The trouble is lampshaded as every pun on Nyguen, including Diane's own email address, has depended on a different mispronunciation.
  • Unsympathetic Comedy Protagonist: A tad, really, since her motives and personality remain sympathetic, being her actions and selfishness what drags her to this trope. Of course, in keeping with the Cerebus Syndrome of the series, it's been slowly deconstructed through her interactions with Mr. Peanutbutter.
  • Unwitting Instigator of Doom: A nasty example in season 5. In INT. SUB, Diane gets sick of BoJack ignoring her need for boundaries, so she writes what she knows about his encounter with Penny into Philbert. While this accomplishes her short-term goal of hurting BoJack, it also starts him down the slippery slope of confusing his own life with the show and thus brings about the most tragic events of the season. She doesn't feel regret in doing that.
  • Uptight Loves Wild: Diane is the reserved, aloof Uptight who is married to the spontaneous, energetic Wild Mr. Peanutbutter.
  • Uriah Gambit: Downplayed. Bitch move as it may have been, Kelsey assigns her the duty to watch over a cable to seemingly get her out of her hair, giving the idea that a consultant is not needed. Tough but non-lethal. Worse, she may have had a point when someone trips over the cable and gets her face burned. While Diane's distracted, trying to get her and Turtletaub to see her as necessary to the team.
  • Vitriolic Best Buds: With BoJack. Despite their volleying insults and frequent frustration with each other, they're inseparable and support each other fiercely. As Roxy notes, that they're willing to go that far for each other despite friction and BoJack is the first person Diane goes whenever there's trouble might indicate something else...
  • Warts and All: BoJack mentions in several occasions to Diane that this is the way he wants his memoirs written and continues repeating it through the first season, despite Diane offering to omit some embarrassing or personal facts she witnesses first-hand from his life. As it turns out, maybe BoJack should have measured his words better.
  • The Watson: Being a ghostwriter assigned to write his memories, Diane's questions and reactions, as well as commentaries to BoJack's Flashbacks lead to the show portraying an increasingly clear portrait of his persona, as well as multiple neuroses and obstacles, as the two of them eventually get to known each other.
  • Weak-Willed: At first; when first shown, Diane has a reserved, quiet nature which she refuses to put aside unless it involves some form of work meeting and submits to her more energetic husband's whims by remaining silent, even if she's against such ideas. She has been getting better lately.
  • "Well Done, Daughter!" Girl: Despite denying it earlier, this is her motivation for all the abuse she takes from her family: She knows it's futile, but she wants some recognition from their part for all the things she has done.
    Diane: The stupid thing is, even now I still just want them to be proud of me and think I did good. Is that really stupid?
  • Wet Blanket Wife: A sympathetic, justified example. Diane can be a little pessimistic about Mr. Peanutbutter's plans and promises, but when you are married to a hyperactive, easily distracted and Secretly Selfish Labrador, being cautious is always welcomed.
  • What the Hell, Hero?: BoJack and Mr. Peanutbutter call her out in different occasions for not taking into account neither of their feelings over certain situations that also affect them.
  • Where Were You Last Night?: At the end of "BoJack Kills", Diane receives an angry call from Mr. Peanutbutter after missing out on calling him back to tell him about her whereabouts and going off route to Ojai, telling her he was worried sick. After some discussion, she agrees to notify him about where she is headed and when she would come home. It's clear that the events from last season haven't washed away.
  • White Sheep: She's the only member of her family that is actually well adjusted and responsible. As such, they treat her with mockery and contempt.
  • Who Are You?: Gets this from Hank after a confrontation in a parking garage in "Hank After Dark". This ends setting her own personal search for identity and self-doubt through the rest of the season. The fact that this question keep popping up in all but name through her life speaks a lot about her quest for discovering it.
  • Women Are Wiser: As it turns out, not by much.
  • Working with the Ex: Initially and with much reluctance, but once they leave things as clear as possible, Diane and Wayne bury the hatchet and are able to work together without any problem.
  • A World Half Full: Her philosophy after reconciling with Mr. Peanutbutter. Life may be far from perfect for her still, but with him by her side, it might just be enough. Except maybe not.
  • You Are Better Than You Think You Are: In their first meeting, none other, Diane gives one such speech to BoJack regarding his work in Horsin' Around by comparing his career to Robert Reed from The Brady Bunch. Although BoJack being BoJack, the analogy backfires:
    Diane: Hey, do you know the story of the dad from The Brady Bunch?
    BoJack: Do I know his story? If I recall correctly, he was bringing up three boys of his own.
    Diane: Right, but—
    BoJack: They were four men living all together, but they were all alone. That is profoundly sad.
    Diane: No, the story is that the guy who played the dad hated being on The Brady Bunch because he was a real actor, and he considered it beneath him. Sound familiar?
    BoJack: That's not all that was beneath him. Gay joke. Sorry, I'm better than that.
    Diane: Most people don't even get to do The Brady Bunch version of the thing they want to do with their lives. You're actually in a really good position now, because you can pretty much do anything you want. You're responsible for your own happiness, you know?
    • In return, when Diane's family has driven her to breaking point, BoJack calms her down by giving her a letter from her pal "Leo":
      Diane: (reading) "Dear Diane, it's me, your old pen pal Leo. This definitely isn't BoJack Horseman writing this."
      BoJack: Keep reading.
      Diane: "You're a good person, Diane, and that's the most important thing. Even if no one appreciates you, it's important that you don't stop being good. I like how you always bring your own bags to the grocery store, and how you're always organized to go places. I like how you chew gum on the airplane so your ears will pop. A lot of people might not appreciate that about you, but I do. Yours forever, Leo." That's the best letter he ever wrote me.
    • And again in season 3 after Sarah Lynn's funeral and BoJack's Despair Speech about being poison to everyone:
      Diane: When I was a kid, I used to watch you on TV. And you know I didn't have the best family. Things weren't that great for me. But, for half an hour every week, I got to watch this show about four people who had nobody, who came together and became a family. And, for half an hour every week, I had a home, and it helped me survive. BoJack, there are millions of people who are better off for having known you.
    • And he returns the favor by telling her what she's been trying to deny the whole season:
      BoJack: I know you don't want to hear this, but you're too good to be writing Instagram captions for celebrities. (Diane tries to make it seem a little more important than it is) I'm sorry, but you are. You know you are.
      Diane: Okay. Thank you.
      BoJack: And I wish you didn't get so distant after you moved out.
      Diane: I'm sorry.
      BoJack: You know me better than anybody, and you can't not be a part of my life.
  • You Gotta Have Blue Hair: Well, a darker shade than usual, but it still looks like she has blue hair.


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