!Ema Hinata
!!!Voiced by: Creator/RinaSato
The main heroine. Daughter of a renowned explorer who often works overseas for long stretches of time, she is used to fending for herself. Upon the start of her second year of high school, however, her father remarries and she moves in with her thirteen newly gained stepbrothers.

* AudienceSurrogate: To the point where she unfortunately gets little characterization of her own.
* BrainyBrunette: {{Implied}} in the anime.
* BrownEyes
* CurtainsMatchTheWindows
* DaddysGirl: Calls Rintarou "Papa". [[spoiler: Even after she finds out that he isn't her birth father, Ema still considers him, her "Papa".]]
* DudeMagnet: Just ask all 12 of her stepbrothers
* GamerGirl
* [[ABoyAndHisX A Girl And Her Squirrel]]: Her best friend in Juli.
* HairDecorations: Wears a heart-shaped scrunchie in her ponytail.
* InSeriesNickname: She is called "Chi" by Juli.
* OrdinaryHighSchoolStudent: Prior to when her father got married.
* MissingMom: Her mom died after she was born.[[spoiler: And Rintarou wasn't Ema's mother's husband, but a friend of her mother and birth father; they both died when Ema was only a baby.]]
* NiceGirl
* SpeaksFluentAnimal: Can understand Juli.
* StrongFamilyResemblance: Rintarou commented on how much Ema resembles her mother. [[spoiler: Who turned out to not be Rintarou's first wife, but a friend and wife of his senior.]]

!!!Voiced by: Creator/HiroshiKamiya
Ema's pet squirrel who has a mysterious ability to speak, though he is only understood by Ema and Louis. Despite his unassuming and cute exterior, he is fiercely protective of Ema and has made it his mission to protect her from "the pack of wolves" she now lives with. He has been with her since she was young and has given her the nickname of 'Chi'.

* BerserkButton: Any of the "wolves brothers" putting a move on Ema.
* BowtiesAreCool: A red bowtie with white polka dots and wear it as a collar.
* CoolPet
* [[spoiler: HumanityEnsues: As the series progresses, it's shown he can become a human.]]
* [[spoiler: LongHairedPrettyBoy: In his human form]].
* LoyalAnimalCompanion: Juli is fiercely loyal to Ema.
* NonHumanSidekick
* {{Protectorate}}: He has vowed to ALWAYS protect Ema.
* PurpleEyes
* SamusIsAGirl: {{Inverted}}. Juli is a male squirrel, but has a name traditionally for females.
* UndyingLoyalty: To Ema.
* [[spoiler: [[YouGottaHaveBlueHair You Gotta Have Green Hair]]: In his human form]].

[[folder:Asahina Brothers]]
!Masaomi Asahina
!!!Voiced by: Creator/KazuyukiOkitsu

The eldest son of the Asahina family. A doctor.

* AfraidOfBlood: Despite being a pediatrician.
* BrainyBrunette: Well versed in the knowledge of medicine. {{Justified}} since he's a doctor.
* BrownEyes
* [[CoolBigSis Cool Big Bro]]: Especially to his youngest brother, Wataru.
* CurtainsMatchTheWindow
* FriendToAllChildren: He loves children and even has a special bond with Wataru.
* [[spoiler:HappilyMarried: In his route with Ema.]]
* HospitalHottie
* {{Irony}}: Despite the fact that Masaomi is a doctor, he does faint at the sight of blood. Virtually every type of doctor has to deal with blood.
* NiceGuy: His brothers aren't horriblr or even jerkasses, but unlike them, Masaomi doesn't force his feelings on Ema, can express his feelings fairly well to her, and is more polite, mature, and mellow.

!Ukyo Asahina
!!!Voiced by: Creator/DaisukeHirakawa

The second son of the Asahina family. A lawyer.

* BerserkButton: Doesn't like being called "mama" by his brothers.
* {{Bookworm}}
* DoggedNiceGuy: His ex-girlfriend, Reiko Amamiya, only dated him to closer to his mother.
* HairOfGoldHeartOfGold
* HandsOnApproach: He does this while teaching Ema to chop meat. [[{{Troll}} Hikaru]] sees this and teases them mercilessly about it.
* {{Megane}}
* MotorMouth: {{Downplayed}}. Ukyo doesn't talk a whole lot, but he can be quite social once he does have someone to talk to.
* RealMenCook
* SharpDressedMan: Wears some pretty snazzy suits.
* SmartPeopleWearGlasses: He wears glasses and is a successful lawyer.
* TeamMom

!Kaname Asahina
!!!Voiced by: Creator/JunichiSuwabe

The third son of the Asahina family. A monk.

* BigLittleBrother: He is more taller and muscular than his two older brother, Masaomi and Ukyo.
* BigBrotherInstinct: Kaname is very protective over Iori. {{Justified}} when it's revealed [[spoiler: that Iori is somewhat suicidal]].
* TheCasanova: Judging by his flirting with Ema, he might be this trope.
* ChivalrousPervert: A flirt? Yes. A NiceGuy who woudn't force his feelings on Ema? Correct again.
* CurtainsMatchTheWindow
* DirtyOldMonk: He's a monk, but tried to kiss his younger step sister.....the day they met no less!
* HairOfGoldHeartOfGold: In the ChivalrousPervert variety; Kaname is described as the "most reliable brother" from Asaomi, the oldest Asahina brother.
* HiddenDepths: He's a DirtyOldMonk who happens to be a NiceGuy and TheReliableOne.
* [[spoiler: ImportantHaircut: In his route Kaname cuts off his long hair, symbolizing that he has changed from the firty, casanova monk to a serious, businessman who would do anything for the girl (Ema) he loves.]]
* LadykillerInLove: Began as a flirt, but comes to stop when he falls for Ema.
* TheReliableOne: Masaomi at one point states that Kaname is the [[HiddenDepths more reliable than himself.]]

!Hikaru Asahina
!!!Voiced by: Creator/NobuhikoOkamoto

The fourth son of the Asahina family. A novelist.

* FieryRedhead: So far {{Averted}}.
* HaremNanny: He keeps track of his brothers' feelings for Ema and teases them about. He even ''[[CrowningMomentOfFunny created a chart with the odds of each one winning her over.]]'' [[spoiler: In episode 12 he tells Ema that her rejections did not get across completely and how the [[TitleDrop 'Brothers Conflict']] will continue, with him in the fray.]]
* LongHairedPrettyBoy
* RapunzelHair: Which he keeps in a ponytail when he isn't crossdressing.
* SignificantGreenEyedRedhead
* {{Troll}}: Loves to watch his brothers' reactions when it comes to Ema.
** Special mention goes to him egging Azusa and Natsume on about their feelings for her, ''while Natsume is driving.''
* WholesomeCrossdresser
* ZettaiRyouiki: When cross-dressing.

!Tsubaki Asahina
!!!Voiced by: Creator/KenichiSuzumura

The fifth son of the Asahina family and the first out of triplets with Azusa and Natsume. A seiyuu.

* BeautyMark: Next to his left eye.
* BlueOniRedOni: The red to Azusa's blue.
* CrazyJealousGuy: Shows some shades of this when he and Ema share their first kiss. He asks her where he got the men's scarf (a Christmas present from Natsume) and admitted it "ticked him off".
* HeterosexualLifePartners: With Azusa.
* OtakuSurrogate: Is obsessed with imoutos and loves anime and games featuring them.
* PeekABangs
* PurpleEyes
* SameSexTriplets

!Azusa Asahina
!!!Voiced by: Creator/KosukeToriumi

The sixth son of the Asahina family and the second out of triplets with Tsubaki and Natsume. A seiyuu.

* AlwaysSomeoneBetter: Unintentionally this to Tsubaki.
* BeautyMark: Next to his right eye.
* BlueOniRedOni: The blue to Tsubaki's red.
* HeterosexualLifePartners: With Tsubaki.
* {{Megane}}
* NeatFreak
* PeekABangs
* PurpleEyes
* SameSexTriplets

!Natsume Asahina
!!!Voiced by: Creator/TomoakiMaeno

The 7th son of the Asahina family and the third out of triplets with Tsubaki and Azusa. A worker at a videogame company.

* BeautyMark: Has one on his chin.
* BigLittleBrother: He's both the youngest and most muscular of the triplets.
* BrutalHonesty: {{Downplayed}}. Natsume is only honest when it's appropriate and he have a point when he's being honest.
* FieryRedhead: {{Averted}}. He's pretty calm and mellow and he dyed his hair an ornage-reddish color.
* InSeriesNickname: He is called "Na-kun" by Wataru and "Natsu-nii" by Subaru.
* [[ABoyAndHisX A Man And His Two Cats]]: Natsume named his two cats after his older twin brothers.
* MostGamersAreMale: He's part of a videogame company; Ema enjoys the games from his company.
* PurpleEyes
* SameSexTriplets
* SmokingIsCool

!Louis Asahina
!!!Voiced by: Creator/KenTakeuchi

The 8th son of the Asahina family. A beautician.

* {{Cloudcuckoolander}}: He has shades of this.
* FriendToAllLivingThings: Implied to be this.
* [[spoiler: HappilyAdopted]]
* LongHairedPrettyBoy
* SpeaksFluentAnimal: Like Ema, he can understand Juli.
* SpellMyNameWithAnS: Despite being obviously a foreign name, his name is still spelled with kanji.

!Subaru Asahina
!!!Voiced by: Creator/DaisukeOno

The 9th son of the Asahina family. An university student.

* AcademicAthlete: Attends Meiji University and is on the basketball theme.
* BigEater: And a fast one.
* CastingGag: Subaru's seiyuu also voices another [[KurokoNoBasuke basketball player, but one with a penchant for horoscopes nanodayo]].
* CannotTalkToWomen: At least not to Ema.
* CurtainsMatchTheWindow
* TheQuietOne: Only says a few sentences in each episode.
* RavenHairIvorySkin: A male version.
* TheStoic: Except when it comes to Ema.
* WhatIsThisThingYouCallLove: He doesn't know how to explain his feelings for Ema, because he's always been interested in basketball.

!Iori Asahina
!!!Voiced by: Creator/DaisukeNamikawa

The 10th son of the Asahina family. A third-year high school student.

* TheAce: The most popular guy in his high school and is well known in other high schools as well.
** [[spoiler: BrokenAce: After we learn of his past with Fuyuka.]]
* BrownEyes
* [[spoiler:DarkAndTroubledPast]]
* [[spoiler: DeathSeeker: After his beloved girlfriend, Fuyuka, dies Iori wanted to commit suicide to be with her.]]
* TheGenericGuy: In every route except his own.
* GreenThumb: Not in the magical sense, but Iori takes care of the Asahina garden.
* [[spoiler: {{Yandere}}: Shows shades of this in his route.]]
* [[YouGottaHaveBlueHair You Gotta Have Gray Hair]]

!Yusuke Asahina
!!!Voiced by: Creator/YoshimasaHosoya

The 11th son of the Asahina family. A second-year high school student and Ema's classmate.

* BookDumb: Implied to be this.
* CannotSpitItOut: He never told Ema his feelings for her. Now since they're step siblings, his crush on her is even more difficult to conceal.
* DelinquentHair
* FieryRedhead
* HotBlooded
* WildHair

!Fuuto Asahina
!!!Voiced by: Creator/{{KENN}}

The 12th son of the Asahina family. A first-year high school student and an idol.

* BigLittleBrother: To Ema.
* [[BrattyTeenageDaughter Bratty Teenage Son]]
* BrownEyes
* TheCharmer
* CurtainsMatchTheWindows
* IdolSinger
* HairDecorations: Wears several barrettes in his hair.
* RedBaron: Known as "Fuuto Asakura" as an idol.

!Wataru Asahina
!!!Voiced by: Creator/YuukiKaji

The 13th son of the Asahina family. An elementary school student.

* CheerfulChild
* TheCutie
* [[GirlsLoveStuffedAnimals Boys Love Stuffed Animals]]
* HairAntennae
* SweetTooth: He loves cakes.

!Rintarou Hinata
!!!Voiced by: Masaki Terasoma

The father of the protagonist, Ema Hinata. He travels all over the world, which left his daughter alone, but he still cares about her and would do anything for her.

* NiceGuy: Despite his job, Rintaoru was still a good father to Ema. [[spoiler: He gets even more points as a nice guy, when it's revealed that Ema wasn't his daughter by birth, but the daughter of his friends. After they died, instead of placing Ema in an orphanage, what did this gut do? Adopted, raised, and loved her like she was his own.]]

!Miwa Asahina
!!!Voiced by: Creator/KikukoInoue

The mother of the Asahina brothers and step mother to Ema. She works as a fashion designer.

* ReallyGetsAround: If the Asahina brothers don't share a father.
* ShipperOnDeck: She would prefer Ema to be with Masaomi.