An exhuberant and cheerful girl who is a child star and who sees the world in such a positive light... until the moment her classmate, Akito Hayama, opens her eyes. At the start of the series she works in a TV Show called "Kodomo no Omocha" and after a while she starts accepting roles that will increase her career.
She is the adoptive daughter of famous writer, Misako Kurata, who found her in a park when she was just a baby (her biological mother, Keiko, abandoned her after giving birth). Misako told her that she was adopted when she was only 5 years old, but couldn't speak about it properly until she became famous and until she "grew up". Sana lives at the Kurata household with her mom, Rei Sagami (her manager), Shimura-san (their maid), and their many dogs.
In Deep Clear, a special crossover made for Miho Obana's 20th anniversary as a mangaka, Sana (now 26 years old) is still working as an actress. She is also married to Akito and is currently pregnant, but due to certain circumstances, her pregnancy was becoming troublesome for her marriage until Shuri Otokawa (an esper and detective, and the main character of Obana's Honey Bitter) is hired to help her.
- Attention Whore: Totally innocent, but she definitely likes being in the spotlight. She's an actress, after all.
- Betty and Veronica:
- The Archie to Naozumi's Betty and Akito's Veronica.
- The Betty to Fuka's Veronica for Akito's Archie.
- Belligerent Sexual Tension: With Akito, especially since they start out as enemies. Even after they start to care for each other, their interactions aren't always peaceful.
- Boke and Tsukkomi Routine: She's always the Straight Man of sorts to any stupidity that comes around, her Weapon of Choice is her rubber hammer.
- Bunny-Ears Lawyer: Just as kooky as she is talented. There's a reason why she's so famous and popular, despite her young age.
- Cloudcuckoolander: She is a little odd and everyone knows it.
- Determinator: During the filming of "The Mansion of Water" she suffered a cracked leg courtsy of Naozumi's crazed fangirls trying to keep her away from him. Not only Sana decided to hide the extent of her injury and continue filming (partly out of sheer spite at her attackers, as she saw it as the perfect revenge), but it ended up improving the final scene, as the pain slowed her down just that much she came out of the house on fire shortly before it collapsed, making the scene that much more awesome.
- The Ditz: On occasion, she can be extremely clueless.
- Dude Magnet: She has so many suitors wishing to have her heart.
- Everybody Hates Mathematics: As shown in the anime, she is not very good at math and even sings a song about how much she hates it.
- Everyone Can See It: With Akito. Many characters seem to notice the Unresolved Sexual Tension between them, and even Akito seems to be aware of it (though he would never admit it) but Sana herself is a bit slow to understand her romantic feelings and for a long time she thinks her closeness to Akito is just a complicated friendship.
- Fiery Redhead: Red hair, fiery temper, and extremely outgoing, enthusiastic, and passionate.
- Genki Girl: She is super energetic and bubbly.
- Girlish Pigtails: In the anime, she uses them as her daily-to-go hairstyle. In the manga, however, Sana ditches this hairstyle choice as she is growing up.
- Gratuitous English: She uses it quite a lot.
- Hair-Trigger Temper: She can be fiery and Hot-Blooded when the moment calls it.
- Happily Adopted: Misako adopted Sana when she was barely a newborn baby. She told her about it when she was just five years old, as a way to make a promise to look for her real mother, once they become famous. But when the moment arrives, Sana declines the biological mother's offer because Misako is her one and only mother.
- The Heart: She manages to inspire and help anyone in need, just ask her friends and her fans.
- Human Hummingbird: Provides the trope's page image. Mix her Genki Girl personality and her Motor Mouth, and she becomes the poster child of this in the anime, where she is almost unstoppable.
- Idiot Hero: Rare female example. Sana is not exactly stupid but she does almost everything thoughtlessly and on impulse.
- Idol Singer: She temporarily becomes one in the anime alongside other two girls, once Zenjiro's show is cancelled.
- Intergenerational Friendship: With Rei. She was nine years old when she found a homeless Rei, who was a dropped-out College student at the time.
- I Want My Beloved to Be Happy: Sana is the one who encouraged Rei to reunite with his old girlfriend, Asako.
- Large Ham: As to be expected from an actress, she's very loud, hammy, and full of life.
- Laser-Guided Amnesia: She has a habit of forgetting unpleasant memories (and the people it involves) when she suffers from her Heroic BSoD.
- The Maiden Name Debate: Deep Clear revealed that she kept her last name upon marrying Akito due to being an actress, though their daughter took his name.
- Malaproper: Sana tends to massacre proverbs, until someone corrects her that they aren't supposed to be like that.
- Manic Pixie Dream Girl: She makes Akito's life so much better and helps him be a more considerate person.
- Meaningful Name: Her mom named her after her birthday, March (San) 7 (Na).
- Mood-Swinger: So much. She can go from excited to calm and serious to angry to excited again in a matter of seconds.
- Morality Chain: To Akito. Thanks to Sana, Akito shows more kindness.
- Motor Mouth: Big Time. Sana's fast speech can only be compared to Excel, where the subtitles can come in paragraphs in a short amount of time.
- Nice Girl: Despite being slightly crazy, she's a goodhearted person who really means well and wants to help everyone.
- Oblivious to Love: Played with — Sana doesn't completely understand where "love" and "friendship" ends, and she can't really identify what is "love" unless someone tells their feelings for her directly. However, she is still affected by it. She can't stop thinking about Akito (that also includes not realizing that he was in love with her even after three different timed kisses) and she gets jealous and brokenhearted when he starts dating Fuuka. She simply cannot explain why she feels like that at those moments. And when Sana finally realizes she's in love with Akito, it's a big deal for her.
- Odd Friendship: How she sees her relationship with Akito for a good part of the series, before she starts to realize how she really feels about him.
- Plucky Girl: In spades. Her optimism and determination are a big part of her personality. The Italian opening describes Sana as "a girl who never gives up".
- Precocious Crush: Even though Rei being her "boyfriend" was only part of a game that went out of control in public, she believes that maybe he is her first love crush, since she didn't see him as a boy toy.
- Savvy Guy, Energetic Girl: The Genki Girl to Akito's stoic Savvy Guy. She also has this dynamic with Naozumi who is rather calm compared to her.
- Selective Obliviousness: Sana becomes very brokenhearted when she hears that Akito is dating someone else. When someone explains the obvious, she tries to rationalize it away one last time.
- She Really Can Act: In-universe. People knew that she could act, but only Rei and Misako knew how well. Poor Naozumi is charmed to the point he can't speak when, during the shooting of their movie, he sees her in action...
- Tsundere: Type B. She's very nice and friendly, but don't make her angry. Just see her interactions with Akito.
A former troublemaker that caused chaos during 6th grade in Sana's class. He is very stoic but also very strong, if provoked. After Sana called him out of all of his "evil doing" at school, she becomes his love obsession.
His family has complicated matters. His mother died when she was giving birth to him, and as a result, this made his father, his sister and himself distanced from each other. Natsumi felt resentful towards him, and his dad was considered a workaholic. As a result, he eventually developed a bad and rebellious behavior around his classmates and also showed a severe disrespect on his teachers. It's thanks to Sana that he started to open his heart and also helped to fix his family ties.
In Deep Clear, Akito (now a 26-year-old adult) is married to Sana and practices alternative medicine in a local hospital. He is initially suspected of a love affair that is keeping him away from Sana, but actually he is very scared about her pregnancy. He is very afraid to lose her the same way his mother died. They eventually reconcile once their baby is born and after she is safe and healthy.
- Academic Athlete: He's very athletic and especially good at martial arts. Unusually for a Troubled, but Cute delinquent, he also gets very good grades, despite his apparent indifference about school.
- Affectionate Nickname: Fuuka nicknamed him "Akki" when they were in kindergarten. She often calls him as such when they start dating.
- Belligerent Sexual Tension: With Sana, especially since they start out as enemies. Even after they start to care for each other, their interactions aren't always peaceful.
- Betty and Veronica:
- The Veronica to Naozumi's Betty for Sana's Archie.
- The Archie to Sana's Betty and Fuka's Veronica.
- Berserk Button:
- Akito cannot stand being called a "demon", mostly because that's the way Natsumi referred to him after their mom died.
- Do not insult his friends, especially if you're calling them a Momma's Boy.
- Bishōnen: Once he gets into middle school, he starts gaining fangirls, who like his cool attitude and his looks... even though his personality is a whole different story. As a grown up and certified doctor, he gets the attention of many of the women working with him... no wonder it was assumed initially that he had a love affair.
- Brutal Honesty: Akito tends to deliver hard and dry truths to anyone, even if they are meant to be cruel, as he doesn't like sugarcoating them. Obviously, Sana is often annoyed with this.
- Chick Magnet: Between Sana and Fuuka, it's implied that he'd be literally surrounded by fangirls if his personality wasn't such a turn-off.
- The Comically Serious: He can be funny in a dry way.
- Crazy Jealous Guy: When Sana is with someone else. That's the catalyst for Tsuyoshi realizing that Sana only saw him as a friend, and that she found out that Rei was only "playing along" with her as her "boyfriend".
- Deadpan Snarker: A subtle example given his stoic personality, but some of his snide comments fall into this.
- Defrosting Ice King: He softens up once Sana changes his heart.
- Delinquents: He was the leader of a bunch of kids who looked up to him due to his rebellious nature. There wasn't a teacher that would lay their fingers on him, because he had his tactics to blackmail them.
- The Dreaded: At school, he's initially feared by everyone, including the teachers. The only exception is Sana.
- First-Name Basis: Although many of Sana's friends do call her by her given name, Akito keeps referring to her as "Kurata" until Middle School. When she returns from filming "The Mansion of Water", it unnerves her that Akito starts referring to her as "Sana" (since he picked it up from Fuuka) all of a sudden, as it was implying that they were much more closer than they were supposed to be.
- Freudian Excuse: Koharu, his mom, died when she was giving birth to him. Natsumi resented him ever since, frequently getting angry at Akito and calling him "devil". In addition, Akito had a distant relationship with his father, who works long hours. This is also something that is played in Deep Clear, since he is afraid that Sana would die in a similar manner as his mother, when giving birth to their child.
- Genius Bruiser: He's physically very strong, and a surprisingly good student.
- Hidden Eyes: The only way he expresses sadness.
- Jerk with a Heart of Gold: He pretends to be indifferent or annoyed, but deep inside he really cares about his friends, his family, and (especially) Sana. After all the trouble that Akito goes through his Freudian Excuse, he develops a heart of gold, even if he hasn't changed lots of his character on the outside.
- Odd Friendship: With Tsuyoshi and Sana (though the latter was obviously more than a friend to him).
- Parental Neglect: Considering that his father was a widower who had to maintain his children, and that his older sister had to double her role as a mother figure when she got older (not forgetting that she also felt resentful to him), Akito rarely stayed at home and often ate fast-food in the streets.
- Perpetual Frowner: A common company to his stoic traits. If he smiles or laughs, it's a big deal for anyone who is involved with him.
- The Quiet One: In contrast to Sana and his other talkative friends, he's not a person of many words.
- Savvy Guy, Energetic Girl: Savvy Guy to Sana's Energetic Girl.
- Sensitive Guy and Manly Man: The tough and stoic Manly Man to Tsuyoshi's cheerful and innocent Sensitive Guy.
- Sprouting Ears: He occasionally sprouts a leopard's ears and tail when he's being particularly cool.
- Sugar-and-Ice Personality: Emphasis on the "ice" part, but he has a warmer side, mainly when he's around Sana.
- The Stoic: He doesn't like to show his emotions and feelings around other people.
- Theme Naming: Each one of the Hayama family is named after the seasons, in this case "Aki" comes from "autumn". This is discussed in-series: Akito's mom chose her children's names precisely for that fact.
- Trademark Favorite Food: Sushi.
- Troubled, but Cute: A handsome, antisocial, moody loner with Hidden Heart of Gold and Dark and Troubled Past. All traits that make him quite popular with fangirls.
- Vitriolic Best Buds: With most of his friends (when it comes to Sana, it's usually Belligerent Sexual Tension).
Tsuyoshi is Akito's best friend. He is a soft-spoken and quite smart kid, who has a general gentle personality... until you make him angry. He has several berserk buttons and throws a whole rage tornado until Akito subdues him and makes him calm down.
He once stated that he was the "rival" to Akito's love for Sana, but after giving her up, he went to Aya, who had a crush on him. Due to certain circumstances that happened at home, his parents divorce, and he starts to cope with the responsability of being much more than an older brother mentor to his little sister, Aono.
- Adorkable: He means well but he is still quite clueless when it comes to girls and romance. Aya likes him anyway, and his kind personality (especially compared to the other guys in his class) is certainly one of the reasons.
- Because You Were Nice to Me: He tends to fall in love with any girl who gives him a gift.
- Berserk Button: If you insult his mother or make him angry for any other sentimental topics of his, beware of his blind rage!
- Beta Couple: With Aya. In the anime, he brings up the example of his relationship with Aya to Akito, when he is trying to resolve the ambiguous situation of his relationship with Sana, before confessing his feelings to her.
- Beware the Nice Ones: Tsuyoshi is normally a very kind and innocent kid, unless he gets insulted (or his mom), and if Aya gets harmed.
- Big Brother Instinct: Towards his little sister. There are moments where he even questions himself if he is doing a good job as a big brother.
- Butt-Monkey: Sometimes, given how innocent he is.
- Disappeared Dad: Tsuyoshi's father is estranged from the family, and it's implied that he physically abused Tsuyoshi; might be the case why he reacts so strongly to people insulting his mother.
- Dogged Nice Guy: Initially, towards Sana, especially because he didn't know it was just for a misunderstanding he had from her affections.
- Hot-Blooded: Especially when people press his Berserk Button, despite being usually nice and soft-spoken.
- Momma's Boy: He loves his mom very much, as Aya explained in front of their class. But if you tease him about it...
- Nice Guy: Who wouldn't want a friend like him?
- Not So Above It All: He's usually the most normal of the characters, but has a few crazy antics himself. Also, he was among the kids who bet Akito he couldn't kiss Fuuka when they were in kindergarten, and when Fuuka resurfaces he actually issues Akito with a death threat should he tell her what had happened
- Odd Friendship: With Akito. Their personalities couldn't be more different.
- The Pollyanna: His family situation may be almost as bad as Akito's. But unlike Akito, he is usually friendly, up-beat, and optimistic... except when he gets angry.
- Sensitive Guy and Manly Man: Sensitive Guy to Akito's Manly Man.
- Serial Romeo: It becomes a plot point about how he easily falls for different girls, because they give him gifts. Early in the series, he's madly in love with Sana but after it's revealed Aya has a crush on him, he suddenly decides he loves her back and they start dating. With him and Aya being Sickeningly Sweethearts, his initial crush on Sana is more or less forgotten.
- Sickeningly Sweethearts: With Aya. They act all lovey-dovey as if they were newlyweds after they start dating.
- Token Good Teammate: Initially, when the other boys in Sana's class were Akito and his Gang of Bullies.
- Unstoppable Rage: When he gets angry. That is until someone (normally Akito) calms him down with a karate chop.
- Vitriolic Best Buds: With Akito.
- When He Smiles: He's pretty low on the bishonen-ness scale, but his smile is enough to make Sana go "wow" for a moment. They don't even show it directly on the manga - and only for a split-second on the anime.
Aya is one of Sana's closest friends at school. She is a very mild-mannered girl who is quiet and sweet, and with a good deal of common sense. She had a crush on Tsuyoshi whom she later confesses on, under the circumstances (little she knew he was one of those kids that fall in love at first "gift"). They start a relationship later without handling these matters, though.
- Beta Couple: With Tsuyoshi. To a Sickeningly Sweethearts extent, when they don't stop talking about each other when they aren't together.
- Brainy Brunette: At least once it's mentioned that she gets good grades, something she has in common with her boyfriend, Tsuyoshi.
- Girl Next Door: Not literally, but personality-wise, she is the typical down to earth and nice girl next door.
- Nice Girl: She is a sweet girl who is always a supportive friend to Sana.
- Only Sane Woman: Amongst Sana's friends and classmates, she is the most normal of them. Except when she and Tsuyoshi are being Sickeningly Sweethearts.
- The Quiet One: Compared to Sana, she is very meek and quiet.
- Satellite Character: Mostly to Sana and later Tsuyoshi, after they start dating.
- Sickeningly Sweethearts: With Tsuyoshi. As soon as they start dating, they act like a newlywed lovey-dovey couple.
- Single Woman Seeks Good Man: She likes Tsuyoshi because he dearly loves his mother and sister.
Fuuka is the first friend Sana meets when she enters middle school. She previously lived in the Tokyo area before moving to Osaka, but then she moved back to start school. Although she shares a bit of the Osaka's stereotypes (the Boke and Tsukkomi Routine and the Kansai Regional Accent), she coupled with the class perfectly. She and Sana became best friends fast because they share some similar traits (physical and emotionally).
During the first days of school, she finds out that an old kindergarten classmate of hers was in the same grade and school as her — Akito Hayama, who was her First Kiss (through a shameless bet). As soon as she starts knowing him, she develops an special interest into him... Both of them start dating when Sana was absent filming "The Mansion of Water", which all started with an innocent Double Date with Fuuka's Old Flame. They later break up because Akito's feelings for Sana never changed, and she was ready to let him go..
- Academic Athlete: She is a good gymnast and a quite good student, too.
- Accent Adaptation: Done badly in the Italian dub. In the original, she has a Kansai accent, while her Italian voice actress gives her a blatantly fake pseudo-English accent.
- The Ace: Athletic, smart, and popular, no one has to wonder why so many of her classmates look up to her. Even Sana gets a little jealous of that aspect on Fuuka.
- All Girls Want Bad Boys: She starts showing some interest in Akito after she starts challenging him over her First Kiss grudge.
- Betty and Veronica: The Veronica to Sana's Betty for Akito's Archie.
- Brainy Brunette: Looks very similar to Sana, but her hair is darker (brown instead of red) and she's also less dense than Sana. She is one of the smartest and more thoughtful students of her class.
- Chekhov's Gunman: She was first mentioned in passing after Akito first kissed Sana, when two guys who knew Akito since kindergarten said he had his First Kiss then (also mentioning that it was for a bet). Of course nobody expected her to actually show up...
- Childhood Friend Romance: With Akito, who went to kindergarten with her and was her First Kiss. She was mildly interested in Akito, and after he showed her how a good friend he could be, that same interest grew up. They eventually start dating after jumping on conclusions about the "Sana was dating Naozumi"'s rumors. Of course, it didn't last.
- Control Freak: During her relationship with Akito, she often scolded him about how he was wearing their school's uniform.
- Genki Girl: To a lesser extent than Sana.
- The Idiot from Osaka: Subverted. Fuuka lived in Osaka for a while, and she still has the Kansai Regional Accent, and while she is obnoxiously hyper (though not any less than Sana, whose personality and accent say "generic Tokyo area native character"), she's quite clever, reliable, and more astute than Sana.
- Plucky Girl: Like Sana, she's usually optimistic.
- Replacement Goldfish: When Akito believed that Sana and Naozumi were together, he dated Fuuka because, for a strange coincidence, she resembled Sana in both looks and personality. This is lampshaded by Fuuka herself in the manga when she talks to Sana about how similar they both were. And then it's something she highlights to Akito, when she wanted to understand him at the end.
- Romantic False Lead: She gets in the way of the Akito/Sana Will They or Won't They? relationship, becoming Akito's girlfriend for a while.
- Tsundere: Though more subtle about it than Sana.
Naozumi is a child actor whose popularity is as great as Sana's. He introduces himself as a person who "knows her secret" it's actually the location of also "secret" moles and confesses to Sana that they share a bond and that he likes her. They first met when they were babies at a time they both coincided at Kamura Institution, the orphanage he took his last name from.
They both share a bond that initially took off from the moment he started looking up at her, and when he became inspired to follow her same steps into acting. But they weren't meant to be together. Sana, oblivious to his feelings, just sees him as a friend and as a brother of sorts.
As an actor, he travels a lot, and it's not surprising he left the country to advance in his career... however, as proved in the follow-up to Deep Clear, Misty Blue, Shuri Ohkawa finds that the adult Naozumi is a very interesting person, who is still devoted to Sana after so many years, to the point of not falling in love with another girl again because of her.
- Better as Friends: How Sana feels about him.
- Betty and Veronica: The Betty to Akito's Veronica for Sana's Archie.
- Bishōnen: He is often referred in the series as a "pretty" and a "cute" boy due to his feminine features.
- But Not Too Foreign: His fans think he is a foreign prince, although his biological roots are still a mystery. The anime plays with this as a vital plot-point of the New York arc, since it's discovered that he has a Japanese mother (a failed theater actress), and an American father (a famous Broadway producer).
- Chick Magnet: Naozumi clearly has fangirls around him (even though he only has eyes for Sana) because he is a child actor who is kind, and looks very cute and pretty.
- Devoted to You: In the special "Misty Blue" one-shot, Shuri (the protagonist of Honey Bitter) finds out that Naozumi is still too devoted to Sana (even after a decade since he confessed his love to her). His relationship with a man is the only way he could feel "happy" in a romantic relationship... because if he fell in love with another girl, he wouldn't stop remembering his feelings towards Sana.
- Dogged Nice Guy: He shares a bond with Sana, but not as he thought it was. He thinks he is more fit than Akito because they share the same career path and a similar past background; however, Sana only looks at him as a friend or as brother... not as a boyfriend.
- Dude Looks Like a Lady: Naozumi has very feminine features that makes him look "pretty". There's a high chance that, if he wasn't famous, people would confuse him with a girl.
- Innocent Blue Eyes: He has blue eyes that coincide with his naivety, and he often possesses a pure soul that cannot be shattered by any of his "evil" intentions. However, as Shuri points it out in "Misty Blue", his eyes are also "painfully beautiful", and that there is a darkness that lay from time to time on his aura.
- I Want My Beloved to Be Happy: Naozumi eventually gives up his love pursuing for Sana, only to see her happy with the boy she truly loves.
- Nice Guy: He really cares about Sana. Quite a lot, actually.
- Parental Abandonment: He was abandoned at the Kamura Institution orphanage when he was just a baby. However, when he grows up, he doesn't show any interest in looking for his biological parents. And in the anime, he finds them out by accident in the New York arc; his real mother abandoned him to give more priority to her acting career in the U.S., and because he was her love child with Gary Hamilton, a famous Broadway producer.
- Romantic False Lead: While Sana and Akito were always meant to be the Official Couple, he was clearly the most prominent out of Sana's other admirers and, at least for a while, an obstacle to Sana's Relationship Upgrade with Akito. It doesn't help that he and Sana often end up playing on-screen couples due to their job.
- Savvy Guy, Energetic Girl: Savvy Guy to Sana's Energetic Girl.
- Spear Counterpart: To Sana. He's a popular male child actor and was raised in an orphanage like Sana (the same orphanage).
- Unlucky Childhood Friend: He grew up in the same orphanage Sana was once in, although she was there for a very brief period of time, and they never met in the orphanage. The result of his confession and Sana's realization of her feelings for Akito varies in the manga (their friendship is broken briefly, and eventually gives her up) and the anime (they start dating after the story arc in New York but he breaks up with her a few episodes later, because he realizes that she didn't get over Akito), though.
- You Gotta Have Blue Hair: He has purple hair and is the only one of the major characters with an unnatural hair color.
She's Sana's adoptive mother. Misako is a famous writer whose life took an interesting turn when she was in her late teens and earlier 20s, and she writes novels and essays based on those facts. Her most famous fiction novel is "The Pimp and I", which was based on her life with her gambler ex-husband.
She always wants to enjoy her life to the maximum (given her weird antics), after receiving the news that she couldn't conceive (it's also one of the reasons she got divorced from her leech ex-husband, too). One day, after taking a walk in a park, she finds a newborn baby in a bench, who she would later adopt and name her "Sana".
Maro-chan, her squirrel, lives in her hair. She also enjoys to make her editor miserable, since she doesn't like to obey due dates for her writings.
- Brainy Brunette: Has brown hair and is an award winning writer.
- Bunny-Ears Lawyer: Similar to Sana, except that her talent is writing instead of acting.
- Cloudcuckoolander: Even more than Sana!
- Drives Like Crazy: Misako drives a toycar inside their house, even without thinking in running over someone who crosses her path.
- Good Parents: She loves Sana and can also give her surprisingly good advice.
- Head Pet: Maro-chan, the squirrel who lives on her head.
- Obfuscating Stupidity: She's absolutely bonkers, but she's also probably both the wisest and the savviest character on the series.
- Troll: She really enjoys messing up with her editor, especially when a deadline is closer.
- Womanchild: Her weird antics, and the reason she often acts as a laid-back parent, is because soon as she realized she couldn't conceive, she decided to live her life to the maximum.
Rei is Sana's manager (and former "boyfriend"). He is always cheering up Sana and taking his job seriously, since he only wants to see her succeed in her entertainment career.
However, there's more than meets the eye. Years ago, just after a series of twists (being dumped by his girlfriend, getting dropped out of college, his parents dying in an accident and basically leaving him without a penny), he hits bottom and becomes a homeless person.
While begging on the streets, Misako Kurata and her daughter passed on, which brought Sana's attention. And one day, she brings him out to their house as if he was an abandoned puppy. Misako decides to keep him around, getting his first established home in a while, and has lived in there since then, working as Sana's manager. At the start, Sana looked at him as if he was her boyfriend (more exactly, a "pimp", after reading her mother's novel), but after being called out by Akito, Rei knew he couldn't keep the charade for a long time, either. Sana gets devastated... especially when Rei's ex-girlfriend appears in their lives and suddenly he realizes that his feelings for her haven't dissapeared either.
Even after the "heartbreak", Sana considers him as her first love crush, and they remain as friends.
- Bishōnen: One of the reasons Sana "adopted" him was because he was a cute and good-looking guy. She even wanted to hide his smile and beautiful eyes... hence why he started using sunglasses.
- Butt-Monkey: Especially, upped to the max in the anime. For example, when Sana gets her first kiss with Akito, Rei gets trapped in the middle of a traffic accident which was probably the result of her afterwards reaction.
- Crazy Jealous Guy: When it comes to Asako, he gets insanely jealous, but he is afraid to face the situation publicly since they are dating in secret.
- Devoted to You: Rei mentioned initially that Asako was the reason his life went down, and that she was a "bad woman" in his life. However, even some time after they first broke up, he couldn't get her out of his mind, and he even became a fan of her from the very start of her career. They later reconcile.
- Drives Like Crazy: This is only applied to the anime series. It's the consequence after Sana provokes him to drive faster because his normal driving pace is very slow.
- Intergenerational Friendship: With Sana, who is ten years younger than him.
- I Owe You My Life: After the bad luck storm that Rei had after the breakup with Asako, Sana appeared in his life. She saved him from being a hobo, and wanted to work for her own sake.
- Large Ham: Mostly in the anime series. He lacks an indoor voice, can be very Hot-Blooded, and tends to be more melodramatic than he has to be.
- Nice Guy: Behind those sunglasses, there's a very kind heart.
- Papa Wolf: He is the first to act when there is something wrong around Sana, always coming to defend her when the moment needs it. He always does so with good intention, even if it could cost her job, as well.
- Parental Abandonment: Rei's parents died in an accident not so much long after he broke up with Asako. He thought they were rich... but they also had lots of money debts, resulting him to go homeless for a while.
- Parental Substitute: After Sana stopped seeing Rei as her boyfriend, he starts acting like a dad for her. To the extreme of being very overprotective to her.
- Recruited from the Gutter: Although Sana "adopted" him (and wanted him to be her "boy toy"), it was thanks to Misako that he has been living with them in their household ever since. He was literally begging on the streets when Sana brings him home, and then he starts working for Misako as Sana's manager, bodyguard, and nanny.
- Sunglasses at Night: Rei uses sunglasses wherever he goes to show his devotion to Sana and because she thinks he looks cool with them.
- Undying Loyalty: To Sana and her family. It's shown in Deep Clear, ten-odd years after the original manga's ending, that he is still working as her manager.
A rare creature mixed from a rabbit and a bat (hence their name, "Babbit"), Babbit serves as both the narrator and Straight Man of the anime series. He also has an entire family and friends who appear in later episodes of the anime.
- Canon Foreigner: Exists only in the anime.
- Continuity Cameo: Even though he doesn't exist in the manga continuity, Miho Obana has drawn him a few couple of times as cameo, more prominently in the last color cover of the series.
- Deadpan Snarker: He would't be the same narrator without his sarcastic one liners.
- Greek Chorus: He provides commentary on some of the events of the episode.
- Plucky Comic Relief: He's not really relevant to the story but he provides comic relief with his hilarious snarking.
- Talking Animal: A cross between a rabbit and a bat who serves as the narrator.
Akito's older sister. Ever since she was younger, she had a grudge over Akito, because he is the reason their mom was no longer with them. Soon after she watches Sana's acting in the TV drama film, she realizes that she was being awful to her own little brother that didn't deserve it in the very first place.
- Big Sister Bully: Initially to Akito since she blames him for their mother's death, and she spends all the time insulting her brother, yelling at him, and being downright nasty and rude towards him. She gets better.
- Broken Bird: She treated Akito like crap because of the deep emotional scars left by Koharu's death.
- Cool Big Sis: Natsumi starts acting more as a caring older sister to Akito, after Sana helped them to overcome their family's issues. To a point where even Natsumi wants Akito to call her "sister".
- Freudian Excuse: When her mother died giving birth to Akito made her very resentful to her brother, calling him a "demon".
- HeelFace Turn: After watching Sana's movie that resembled her life, Natsumi realizes her wrongdoings and redeems herself.
- Maternal Death? Blame the Child: The reason why she treats Akito like crap, it wasn't until the mentioned HeelFace Turn above when the two finally reconciled.
- Missing Mom: Unlike Akito, she actually met and remembers her mother, and has brief memories of her... although The Reveal that she was a yanki didn't sit well with her.
- Theme Naming: As with the rest of the Hayama family, her first name is related to "seasons". "Natsu" comes from "summer".
Akito's workaholic dad, who initially guards some distance with his kids. Not long after Sana opens his eyes, he realizes he need to spend some quality time with his children, to fix everything that was broken ever since Koharu's death.
- Affectionate Nickname: In Japanese, Sana affectionately calls him "Hayama-chichi" ("Daddy Hayama"), instead of using honorifics.
- Bumbling Dad: A rare dramatic example. Akito's issues steam from Fuyuki's inability to raise him as a single parent without blaming him for the death of his wife Koharu.
- Cloudcuckoolander: In the anime, he seems to be on the same frequency channel as Misako's weird antics. He is more down to Earth in the manga.
- The Comically Serious: He has a dry humor similar to Akito's.
- Doting Parent: Once the family issues subside, it's evident that he's immensely proud of his children and even tries to pamper them a bit (one of the few things Akito likes is sushi, so Fuyuki brings takeaway every now and then).
- Dull Surprise: Dull everything more like.
- Good Parents: When he finally realizes what his home situation is really like, he becomes one. In one episode where Akito is framed for shoplifting, his father gives a long speech about how he expects Akito to come forward with the truth on the situation. All Akito says is he didn't do it, and his father adamantly believes him just because he has that much faith in Akito.
- Japanese Delinquents: During his youth, he used to be part of a gang with his wife, to everyone's surprise.
- Overprotective Dad: After the family issues are solved.
- Papa Wolf: A bit on the "passive" side, but sometimes surfaces.
- Salaryman: His daily job which is the initial cause of why he was so aloof from his children, especially after Koharu died. This took a turn for worse when he was overdoing it, and he went to the hospital.
- Shared Family Quirks: Both he and his son are serious, polite, silent, and kind-hearted, but with a violent streak when angry. Of course, the main difference is that Akito is angry all the time, while his father is (almost) never angry.
- Theme Naming: As with the rest of the Hayama family's names, his first name is related to the seasons. "Fuyu" comes from "winter".
- Japanese Delinquents: She and Fuyuki used to be delinquents during their youth. Even when Natsumi was a baby, she retained some of her old teenage habits, especially in the dialect she used to speak... shredding present-Natsumi's memories of her mom to the ground.
- Missing Mom: To her family, since she has been absent from their life since Akito was born. It was the catalyst for the whole Hayama family distancing from themselves ever since, because they got badly traumatized by the event.
- Nice Girl: She was a total sweetie, according to the flashbacks.
- Posthumous Character: We only meet her through flashbacks and memories about her. She later appears as a ghost who interacts with a dying Akito, convincing him he still has lots to keep living for, instead of dying.
- Theme Naming: As with the rest of the Hayama family's names, her first name is related to the seasons. "Haru" comes from "spring".
Rei's girlfriend. Asako is supposed to be the reason Rei went through a bad luck storm in his life after their breakup, which happened due to her wanting to pursue an acting career in high school. Now an established drama actress, and in the middle of a TV drama film recording, she not only meets Sana, but also reunites with Rei.
After their reconciliation, she is dating Rei in secret. Mostly because Rei doesn't want themselves to be involved in any scandal that would harm her or Sana in one way or another.
- Cool Big Sis: Sana starts looking at Asako as such when they start filming "The Mansion of Water". Asako helps her realize her feelings towards Akito, after she gets sentimentally hurt about him dating Fuuka, because Sana loves him.
- Dude Magnet: As expected of a famous actress, she gets the attention of many men... be it her own cast mates (as Kawai, in the film set of "The Mansion of Water") or other celebrities (as shown in the anime, with Takuya Kimuchi).
- Long-Distance Relationship: Her relationship with Rei after they reconcile, since Asako is an actress (who has to move around a lot) and they are supposedly dating "in secret".
- Old Flame: Her breakup with Rei happened not so long after she expressed to him that she wanted to pursue an acting career seriously. Many years after this, and after many things that happened, they reunite to clear up some missunderstandings about their breakup, mostly because they still felt something for each other ever since.
Sana's biological mother, who gave birth and then gave her up when she was barely 13-14 years old. She later has another daughter, Mariko.