Voiced by: Saeko Chiba (Japanese), Kate Oxley (English)
Portrayed by: Annie Wu (TV series, Taiwan), Mizuki Yamamoto (film)
The protagonist of Peach Girl, a high school girl. Has a had a crush on Toji since middle school and subject to the schemes of Sae.
- Dark-Skinned Blonde: From being on the swim team in middle school and having her hair bleached accordingly.
- Dub Name Change: She's known as Xiao Tao in the Taiwanese TV drama.
- Gyaru Girl: Because of her bleached hair and tanned skin. she's often mistaken for this, as the series takes place in The '90s and the Turn of the Millennium. It's also the root of several rumors about her and the way she is treated by people.
- Hair of Gold, Heart of Gold: Despite her reputation, Momo is really a kind person. She even helps Sae throughout the series despite what she's had to deal with because of her.
- Insecure Love Interest: Is this for Toji at first, believing he would not like her to due to her tanned skin.
- The insecurities return when Toji dumps her for Sae and Momo doesn't know why.
- Is this again when she finds out that Kairi is in love with Misao.
- Trauma Conga Line: Poor, poor Momo. The constant victim of harassment by dirty old men, classmates, Attempted Rape, and Sae but also suffers constant heartbreak.
Voiced by: Hidenobu Kiuchi (Japanese), Robert McCollum (English)
Portrayed by: Kenji Wu (TV series, Taiwan), Mackenyu (film)
Momo's longtime crush, classmate and later boyfriend. As well as Sae's boyfriend for a period.
- Dub Name Change: Known as Dong Si in the Taiwanese TV series.
- Expository Hairstyle Change: Gets a buzz cut after he is rejected by Momo after the incident at the hospital.
Voiced by: Kenichi Suzumura (Japanese), Orion Pitts (English)
Portrayed by: Vanness Wu (TV series, Taiwan), Kei Inoo (film)
The resident playboy of the school, friend of Momo and later, her boyfriend and eventually fiance.
- Because You Were Nice to Me: The reason why he falls in love with Misao is because she is the only person who treats and respects him as an individual.
- Later this is the reason why Momo falls in love with him.
- Cassandra Truth: Is fond of these in order to keep a certain playful facade.
- Chivalrous Pervert: Is this but is likely the most caring person towards Momo aside from Misao.
- Dub Name Change: His name is changed to Ah Li in the Taiwanese TV series)
- The Gadfly: He loves to provoke and tease people. He's practically hit by every major character.
- Determinator: Travels 13 miles at night during a typhoon in order to keep a promise to meet Momo at the beach after he realizes he truly loves her.
- I Want My Beloved to Be Happy: He constantly puts Momo's interests ahead of his, even setting up Momo and Toji at the expense of his feelings.
- Last Guy Wins: In the end, Momo decides to be with him and they later become engaged in a sequel series.
- Living Emotional Crutch: Becomes this for Momo. It later becomes a point of concern as she can't parse if her feelings for him are genuine.
- Later, the roles are switched, he fears that Momo is this after Misao rejects him.
Voiced by: Mami Kingetsu (Japanese), Colleen Clinkenbeard (English)
Portrayed by: Vicky Chen (TV series, Taiwan), Yuika Motokariya (film)
The school nurse, voice of reason, longtime friend of the Okayasu brothers, and Kairi's former tutor and first love.
- Horrible Judge of Character: Still considers being with Ryo even after he cruelly rejects Sae when she thinks she's pregnant with his child. She gets over it though.
- Hollywood Pudgy: In universe. Considers herself to be fat but is chubby at most.
- Reasonable Authority Figure: Well, a school nurse at least.
- Unrequited Love: Does not return Kairi's feelings for her, seeing him as more like a little brother.
- She feels this way towards his older brother however.
- What Does She See in Him?: How Kairi feels about Misao in regards to Ryo.
Voiced by: Megumi Nasu (Japanese), Cherami Leigh (English)
Portrayed by: Guan Ru (TV series, Taiwan), Mei Nagano (film)
- A Day in the Limelight: The sequel "Ura Peach Girl" is focused on her.
- Bitch in Sheep's Clothing: Despite being one of the popular girls in her school, she's actually jealous of Momo to the point of manipulating others.
- Break the Haughty: Toji exposing her treachery to the whole class becomes one for her. Her classmates bail on her and her pride takes a downfall.
- Childhood Friends: With Kanji, as revealed in "Ura Peach Girl". They even made a Childhood Marriage Promise before Sae became an Alpha Bitch.
- Coy, Girlish Flirt Pose: In playing up her victim-hood and innocence.
- Destructive Romance: Has this with Goro. Later becomes victim to this with Ryo.
- Dub Name Change: Her name is changed to Sha Hui in the Taiwanese TV series.
- Driven to Suicide: In the film, when she realizes the truth about Ryo, she rushes to the bathroom and attempts suicide.
- Evil Gloating: Loves to brag about her exploits. Often to make Momo jealous and insecure.
- Fatal Flaw: She's fond of tricking others into thinking that she's a victim of their abuse and it causes her to make decisions that end up turning her friends against her.
- For the Evulz: She bullies Momo out of jealousy and spite.
- Freudian Excuse: As revealed in "Ura Peach Girl", she used to be an Ill Girl whose only friend was Kanji. Looked down by her parents due to her weak constitution, she vowed that nobody would look down on her ever again. Afterwards she became the Alpha Bitch we all know.
- Laser-Guided Karma: After humiliating Momo for most of the series, Sae gets humiliated by Toji, the same person who was blackmailed by her, and abandoned by her fellow classmates.
- Love Makes You Crazy: Still wants to be with Ryo after he tries pimping her.
- Manipulative Bitch: She often manipulates others to do her deeds, like ridiculing Momo. At the end of the series, she once again uses her manipulative nature to help others without any personal gain. This results in Momo realizing that it's Kairi who she loves most in the end.
- Never Had a Birthday Party: "Ura Peach Girl" reveals that her parents were so shallow and distant they never bothered to celebrate her birthday. At the end of the manga, Momo, Kairi and Kanji solve this by making her a birthday party and buying 19 cakes to make up for all her missing birthdays.
- Shipper on Deck: Can see that Momo and Kairi genuinely love each other and actually goes through the effort to set them up. She even accompanies Kairi when he believes Momo is danger of a typhoon, twice.
- Stalker with a Crush: Towards Ryo after Misao confesses her feelings towards him.
- Teen Pregnancy: Is thought to be pregnant with Ryo's child. Turns out it was all psychological.
- Villainous Breakdown: Sae loses it when Toji tells his fellow friends at school about what she did to Momo. However, she can't do much while her classmates bail on her.
- Vitriolic Best Buds: With Momo at the end of the manga and "Ura Peach Girl".
Voiced by: Junichi Suwabe (Japanese), Victor Walker (English)
Portrayed by: Duncan Chow (TV series, Taiwan), Daisuke Kikuta (film)
A popular male model and briefly the boyfriend of Sae.
- Destructive Romance: Has a one-sided romance with Sae.
- Dub Name Change: Known as Lu Wu Lang in the Taiwanese TV series.
- Horrible Judge of Character: Falls in love with Sae due to her perceived fragility and manipulations, even going as far to go along with Sae's plan to rape Momo.
- He later see she's not what she seems later on.
- Put on a Bus: After Sae's plan falls through, he is mostly only mentioned.
- The Bus Came Back: Towards the end of the series, Sae contacts him to have explain what really happened at the hotel and apologize.
Voiced by: Sho Hayami (Japanese), Charles Baker (English)
Portrayed by: Kensei Mikami (film)
Kairi's older brother and later boyfriend of Sae.
- Adapted Out: He doesn't appear in the Taiwanese adaptation.
- All Take and No Give: How his relationships with women are.
- The Charmer: Stole all of Kairi's girlfriends.
- Would Hit a Girl: Slaps Sae when he's fed up with her and no longer wants anything to do with her.
Portrayed by: Takeshi Masu (film)
Kairi and Ryo's father.
Portrayed by: Momoko Kikuchi (film)