The story's protaganist, Hideki is an Ordinary Cram School Student who lives in a Japan where almost everyone has his or her own "Persocom" to do common tasks, ranging from household chores to surfing the Internet. Now, Hideki would very much like his own Persocom, but there's no way he can afford one... until he finds one lying in the trash. Little did he know that this persocom girl would change his life forever...
- Accidental Pervert: He is prone to accidentally seeing Chii when she's naked or somehow revealing a precious body part. This happens in the anime much more frequently than in the manga.
- Adaptational Badass: Shows to be incredibly strong in the anime, able to carry a shut down Chi walking what appears to be several blocks and he even attempts to carry her over a long steep ridge. On top of that he goes into a few fights in the anime and exhibits some techniques such as sweeps. Justified as Hideki is established to have been helping out on his family's farm before moving to Tokyo in the anime.
- Adorkable: His awkwardness and silly shenanigans when dealing with Chii makes him all the more endearing.
- Alcohol-Induced Idiocy: During a drinking session with Takako at his place, he got so drunk that he apparently did the full monty.
- Berserk Button: Pretty much anything involving Chi. Also on occasion, Sumomo's programming.
- Book Dumb: Not a stupid character but can't make the tests in university.
- Chivalrous Pervert: While he is a pervert, he doesn't really want to be one and genuinely tries to look after Chii.
- Dub Name Change: Lee Hi-su in the Korean dub.
- Farm Boy: He starts out as this and has huge problems when he goes to the big city (Tokyo).
- Flipping the Table: Once does this when he is frustrated with his homework.
- Hopeless with Tech: Justified as he is too poor to own a persocom, and thus is hopeless when it comes to understanding their functions and norms of operation. Thankfully, Shinbo and later Minoru helps him out in this department.
- Imagine Spot: Gets into this a lot on Yumi, Takako, and Chitose during the first half of the series.
- Large Ham: If Friendship Is Magic hadn't come out after Chobits, one could be forgiven for thinking that Hideki had taken some lessons from Rarity, as he can really pack on the ham sometimes.
- Meet the In-Laws: A dramatic version happens at the final manga arc, as Chitose, the mother-in-law, narrates to him Chii's origins. Later on, Freya, sister-in-law, also gets to "interview" him. Both times, he won the approval of the in-law.
- Nice Guy: He is friendly and mild mannered, but being a Large Ham scares some people off. He's only overtly bothered by his girlfriend-less virgin status when other characters talk about how tragic it is that "such a good guy can't find himself a girlfriend".
- Nosebleed: Is a frequent sufferer of these in the anime, especially when Chii is being a Innocent Fanservice Girl.
- One Degree of Separation: At the start of the story, he already knows most of the human cast personally. The only ones who he doesn't know are the tech experts (Minoru and Kojima).
- Simple-Minded Wisdom: While Hideki is not very intelligent (struggling with cram school) and a virgin who has never had a relationship before, his words had a major emotional impact on both Yumi and Minoru. With his help, Yumi made up with Hiroyasu, and Minoru grew to love Yuzuki as an actual "person", and no longer just a surrogate for memories of his sister.
- Thinking Out Loud: Often happens to him, since he lives alone (before picking up Chii). He comments that it's because he's used to living on a farm where the only ones to overhear him are cows. This has caused him some major embarrassment."Where can I buy inexpensive panties? I really need to buy panties!"
- Unlucky Everydude: His defining character trait. He has problems to fit into his new city life, rather sucks at university, is helpless with technology and is rather unlucky. Chi is the best thing that ever happened to him.
Hideki's good friend and fellow cram school student. He's the owner of Sumomo, whom he frequently lends to Hideki.
- Dogged Nice Guy: He keeps pushing the issue with Takako. He won't let it go, no matter how much she reminds him of the barriers between them.
- The Lancer: To Hideki during Chii's kidnapping and rescue. He was the one who joined Hideki with the search on foot, and suggested keeping Kotoko at Hideki's place and recording Kojima's statement that he had "willingly" relinquished Kotoko's control to Hideki.
- Teacher/Student Romance: He eventually marries Shimizu-sensei.
- Mr. Exposition: He is one of Hideki's guides to persocoms alongside Minoru, though he usually takes care of the basic stuff.
Hideki's landlady, who always greets him with a kind, gentle smile.
- Big Good: She is a co-creator of the Chobits with her husband, Chi's "mother", and the one writing the books that Chi reads which develop the "person just for me" plot thread.
- Broken Bird: She may be an OneeSama to Hideki, but she also lost her twin persocom daughters due to one of them falling in love with her husband. Then, her husband died. To rub salt to the wound, her amnesiac daughter ends up living in the apartment which she rents out, and she can't do anything other than observe from a distance.
- Landlady: She is Hideki's benevolent landlady and always has some nice words for him.
- Nice Girl: She always friendly, is on good terms with Hideki and instantly likes Chi.
- Smart People Wear Glasses: In her past as a persocom scientist.
- Stepford Smiler: She never fails to greet Hideki with a smile whenever they meet; she often cries when reminiscing about her husband or her twin persocom daughters.
- Team Mom: Of sorts. She's always there to help Hideki (and Chii) out with their problems.
- Widow Woman: Her husband passed away before the start of the series.
A persocom/tech expert, Minoru was introduced to Hideki by Shinbo, to help Hideki find out who/what Chii was before she lost her memories. He owns several persocoms, with Yuzuki as his favourite.
- Character Development: From a person who tries to view persocoms as objects and strives to have a professional relationship with them, to one who sees them as individuals in their own right, to be loved if a person chooses to do so. This is made especially clear to him when Yuzuki attempts to hack the national data bank and becomes comatose, realizing Yuzuki has become just as irreplaceable as Kaede.
- Child Prodigy: Is a pint-sized computer whiz. It is deconstructed in that it is implied he was this good with technology at such a young age due to his Lonely Rich Kid status, that is, his status as such provided both the resources and the motivation to become as good as he is to rectify the "lonely" part.
- Covert Pervert: Possibly, if the skimpy outfits he has his custom-build persocom maids (except Yuzuki) wear is any indication.
- Dub Name Change: Deokgo Jeongmin in the Korean dub.
- Lonely Rich Kid: Parents are absent (very likely deceased), elder sister passed away also. Also has lots of money, which certainly helps him with his "computer whiz" part. His only companion is a persocom which he built himself as a replacement for his sister.
- Mr. Exposition: He is one of Hideki's guides to persocoms alongside Shinbo, though he usually takes care of the more advanced stuff.
- Smart People Wear Glasses: An unusual case, as he only wears glasses while busy.
- Troll: It's implied that he dresses his persocom maids in skimpy outfits to get a rise out of his guests. Crosses over with Covert Pervert.
- TV Genius: He's super good with technology but also speaks in very tiring monotone voice, has boring interests and doesn't seem to ever leave his house. However he dresses his persocoms in a very suggestive way.
Hideki's teacher at cram school.
- Armor-Piercing Question: To Hideki."Do you like being with a persocom more than with a human?"
- Dub Name Change: Cha Myeong-hwa in the Korean dub.
- Teacher/Student Romance: Shinbo eventually marries her.
- The Tease: Towards Hideki during the one time she stayed in his apartment.
- Trauma Swing: Is caught doing this in a flashback by Shinbo, and she tells him that her husband's basically forgotten her because of their persocom which he's become obsessed with.
Hideki's former employer (in the manga), who runs his own bakery.
- Conveniently an Orphan: This conversation between him and Hideki.Hideki: Didn't your parents object [to marrying a persocom]?Hiroyasu: Both of my parents had passed away.
- Dub Name Change: Woo Yeong-jae in the Korean dub.
- Nice Guy: Personality-wise, one can hardly find any faults with him, apart from his... unusual choices of partners.
- Older Than They Look: So much so that Hideki is surprised when he's told of Ueda's real age (36, making him twice as old as his love interest Yumi). He lampshades it by saying that people tell him he has a baby face.
Hideki's colleague at the pub where he works part-time. She has a particular dislike of human-sized persocoms.
- Buxom Is Better: She is quite well-endowed for her age.
- Contrived Coincidence: She was the next assistant to work at Ueda's bakery after Hideki left the job.
- Dub Name Change: Kang Yu-mi in the Korean dub.
- Identical Stranger: To Ueda's persocom wife, minus the Unusual Ears. Yes, this causes issues.
- Naked Apron: In one of Hideki's Imagine Spots.
- Pragmatic Adaptation: In the manga, she is just one of the pub's employees. In the anime, she is the daughter of the pub owner.
- Second Love: For Ueda. Unusual in that the guy's first love is a non-human.
- Trying Not to Cry: When she saw Chii wearing her old bakery uniform.
Another tech/persocom expert like Minoru, but employs rather shady methods to satisfy his curiosity. He's the original owner of Kotoko. His online moniker is "Dragonfly".
- Dub Name Change: Do Yeong-man in the Korean dub.
- Never Live It Down: In-Universe example, as Minoru and Hideki never lets him forget that he once kidnapped Chii.
- Smart People Wear Glasses: Yes, despite the fact that he can be a bit of a Jerkass at times, he actually does bring some pretty good information to the table most of the time. Although Hideki just thinks it's always false.
- Smart People Build Robots: And he has over 20 of them that he built including Kotoko.
The persocom whom Hideki finds in the trash. With Hideki's help, she spends the first half of the series adjusting to the real world, as she apparently was not programmed to do so. However, it eventually became clear to Hideki that she is more than what she appears to be.
She is actually an amnesiac Elda, one half of the "Chobits", created by Chitose's husband as daughters for his wife. She was created in an attempt to lift Freya's spirits after Freya started to have feelings for her creator-father.
- Adaptational Wimp: In the anime, her ultimate form shuts down all Persocoms and can cause power outage which is impressive........ Except in the manga she can actually cause physical destruction which is shown to be at least powerful enough to destroy a block's pipe system and cause it to burst out of the ground.
- Artistic License Physics: She is a lot heavier when switched off. While this might make it harder to steal her, it doesn't make sense from a scientific viewpoint.
- Constantly Curious: From the moment she's switched on, she is curious about everything Hideki does, although it's mostly not much. She also puts herself in danger when looking for a job and landing in the hands of Yoshiyuki Kojima.
- Cute Mute: A cute Persocom who initially can't talk. However, she doesn't stay mute for long.
- The Cutie: She is naive, pure-hearted and unbelievably adorable. She's so adorable that you may die of cuteness.
- Giving Someone the Pointer Finger: She points at people and things which she learns about. No one minds, because she's too gosh darn cute (though they do advise her gently not to do it again).
- Glomp: Jumps and hugs a lot, especially at the start, because she hasn't grasped that it's not polite to do that in public.
- Hair of Gold, Heart of Gold: Her long blond hair is reflective of her innocence and kindness.
- Heroic Sacrifice: Gave up her memories and the chance to stay by her parents' side so that her sister's data would not be lost. She gets better not long after that.
- Innocent Fanservice Girl: Having no memories also means she doesn't have a nudity taboo. Also, she wears a Naked Apron without having any idea what it means, because she thinks it would make Hideki happy.
- Is It Something You Eat?: Her response when she is being told she's been "abducted."
- Longing Look: From the moment she sees the picture book in the book store, she identifies with the main character and gets sucked in immediately. This turns out to be an important plot point later.
- Magical Girlfriend: Hideki is an unlucky loser but when he finds her, his life changes a lot. She is beautiful, kind and eternally devoted to him.
- Meaningful Name: While it's is not clear until near the end of the series, Chi comes from Chobits, originally Chii/Elda and Freya's password, which was really a made up word from 'chobi' and Chitose's name by their creator-father.
- Pokémon Speak: At first she can only say "Chi!", but she learns to say more later on.
- Power Glows: She begins glowing brightly whenever she is levitating, doing intense introspection, and especially when she is threatened in any way. If she is glowing while looking at you angrily, it is already too late to run away. This is due to Freya taking over to protect her sister.
- Rapunzel Hair: Her extremely long hair, with an odd habit of flying around of its own volition (in the manga). A later instance of this occurs with Chii weaponising the cables Kojima plugged into her connector ports.
- Robot Girl: She is a persocom but with some specialities. All of her software seems to be erased but she still can learn.
- Sexy Santa Dress: Wears a Santa dress in an Omake pic in the Manga.
- Superpowered Evil Side: Freya isn't really evil, but she is laser-focused on one thing and one thing only: keeping Chi safe and happy. Anyone who jeopardizes that runs the risk of having Freya manifest and do whatever it takes to protect her sister. The sudden switch from Chi's generally pleasant facial expressions to Freya's cold and angry ones is quite unsettling.
- Verbal Tic Name: Initially, the only thing she could say is "Chi" (that was how Hideki named her). Eventually, she'll say her name when she's puzzled or happy.
- What Is This Thing You Call "Love"?: She has to figure out what love means before she can choose "the one for me and only me".
Shinbo's persocom, whom he loans frequently to Hideki. She's palm-sized, and thus not very powerful in terms of processing power. Her name means "plum". Later in the story, Shinbo gave her away to Hideki.
- Boke and Tsukkomi Routine: With Kotoko after she joins the team. She is the one getting smacked for being silly.
- Genki Girl: With shades of Cloud Cuckoolander as well. She is very hyperactive and just can't sit still. You can blame Shinbo for this.Sumomo: "Sumomo is programmed to dance when on standby!"
- Kawaiiko: She is cute and cheerful and says things like 'Wakey, wakey exercises'. Again, Shinbo programmed her this way.
- No Indoor Voice: She cannot even keep her voice down thanks to how she is programmed.
- Non-Standard Character Design: This is a little more noticeable in the manga, but Sumomo lacks the "ears" (connector ports) that a number of other persocoms (apart from Yuzuki and Kotoko) have. Justified though, in that she's a custom design.
- Rule of Cute: Lots of stuff that she does is because Shinbo programmed her that way. Hideki does sometimes grumble about Shinbo's programming.
Minoru's chief persocom. Modeled after his deceased sister, Minoru cares greatly about her.
- Dub Name Change: Roji in the Korean dub.
- Divergent Character Evolution: After her failed hack on Zima damaged her data which replicates Kaede's personality, Minoru decided not to replace the lost data, and convinced Yuzuki that she can be her own "person". Just before the final manga arc, when Chii noticed that Yuzuki was speaking differently, Yuzuki cheerfully admits that she's ok with that.
- Non-Standard Character Design: Lacks the "ears" that most persocoms have (save for Sumomo and Kotoko), although justified by being a custom design. It's also possible that they're hidden by her hair.
- Replacement Goldfish: Minoru modelled her to be a replacement for his sister. At least at first he did, then he decided to let her develop organically.
- Robot Maid: Wears the Meido outfit, although her status is more akin to that of a butler. Besides domestic functions, she's also a surrogate elder sister and hacking device.
Kojima's persocom. Palm-sized like Sumomo, she is more powerful due to being custom-made by her master. After Chii's kidnapping was resolved, Kotoko was placed under Hideki's care so that Kojima cannot delete incriminating data from her system.
- Boke and Tsukkomi Routine: With Sumomo. She's the one doing the smacking.
- Cannot Tell a Lie: Because of her programming, Kotoko is programmed to never lie, even when it's non-beneficial to her master.
- Deadpan Snarker: Tends to snark with an unimpressed look when she acts as the Only Sane Man.
- Dub Name Change: Koko in the Korean dub.
- Expy: Seems to be a Blue Oni persocom version of Li Meiling from Cardcaptor Sakura, which is another Clamp work.
- Foil: Is programmed to be very snarky in contrast to always upbeat and hyperactive Sumomo.
- Non-Standard Character Design: Lacks the "ears" that other Persocoms have. Justified in that she's a custom design and her cables are in her bells.
- Odango Hair: Her hair is styled into a pair of "meatballs". Presumably, this was Kojima's artistic preference.
- Red Oni, Blue Oni: The blue to Sumomo's red due to her dry wit and lower energy.
Ueda's persocom. Her master's experiences with her affected his subsequent relationship with a human girl.
- Good Old Robot: Her master could have transferred her memories to a new hard drive, but he refused because the transfer might not have worked. He couldn't let go of any part of her. Justified, as Ueda actually married her. At the same time, the concept is deconstructed, as the main reason why the transfer might not have worked was that she was an obsolete model.
- Forgetful Jones: Due to her faulty hard drive, she began forgetting things she heard mere minutes ago, and her master had to constantly reintroduce himself to her.
- Identical Stranger: Resembles a certain human girl her master met after her "death".
- Posthumous Character: She "died" before the start of the series after pushing Ueda out of the way of a car.
Chi's twin persocom sister. After falling in love with her creator-father, the strain from the unrequited love eventually caused her systems to break down. Her twin Elda allowed her programming to be transferred over to Elda's system, at the cost of Elda's memories.
She's sometimes referred to as "Dark Chii", due to her preference to appear in dark clothing when talking to her sister.
- Big Sister Instinct: What any good elder sister will do when her younger twin sister gave up her memories to save her. She is quick to act when her younger sister is in danger.
- Dark Is Not Evil: As mentioned, she has a dark motif associated with her. But, she gives good advice to her sister, and would protect her if things go south.
- Death by Despair: The emotional pain of loving her creator eventually caused Freya to break down. As she describes to Chii, at that state the unrequited love made her just want to turn herself off forever, with the final push being her confession to her creator and knowing the answer already. She only didn't completely cease to exist because of Elda's sacrifice.
- Meaningful Name: Freya is the name of the Norse goddess of love and fertility. She was originally created to be a daughter to the barren Chitose and be able to love in return.
- Electra Complex: While she wasn't his biological daughter, she fell in love with her creator, who saw her as just his daughter. This and the fact she loved her 'mother' and didn't want to hurt her ultimately caused such emotional strain she broke down and eventually ceased to function all together.
- Polar Opposite Twins: To Elda, after she lost her memories. While Chii is naive and carefree, Freya is serious and carries some pretty hefty emotional baggage with her.
- Pretty in Mink: One of her dresses in the manga is fur-trimmed.
- Super Prototype: Her sister and her are the legendary 'chobits' whose specs are higher than the standard issue persocoms. She was also the first, Elda being the Beta to her Alpha.
- Used to Be a Sweet Kid: Before her emotional issues popped up, she was just like her sister.
- Walking Spoiler: Saying anything about her would immediately spoil the main twist of the plot.
- You Wouldn't Like Me When I'm Angry: Threaten her cute, amnesiac twin sister, and she will take over her sister's body and tear you a new one. Kojima found this out the hard way.
Two persocoms sent by the government to to find Chii before she can finish executing her final program. Zima serves as the national data bank for the Japanese government and Dita as a pro-active firewall program.
- Big Bad Duumvirate: Seem to be this, given that the government's goal is to stop Chii from executing her final program and the anime DVD front cover suggests they are the main antagonists. However, Zima has his doubts about if it's the right thing to do, and even disables Dita to stop her from doing so.
- Bodyguard Crush: It is implied that Dita has a vested interest in protecting Zima beyond her programing. Dita becomes this after Zima prevents her from stopping Chi's programming by disabling her.
- The Chessmaster: Zima was the anonymous individual that sent the photos of the Chobits and the map of Chii's location, and judging from what he says to Dita in the end, he did so because he wanted Chii to be happy, knowing her feelings would impact if the program would need to be activated.
- Sunglasses at Night: They are only seen during night-time and don't take them off.
- Those Two Bad Guys: They are always seen together and don't feature much in the plot (yet they are important).