Belly is the main protagonist in the story, Belly used to be gawky and awkward, but when she turned 16 her identity completely changed, she is starting to turn some heads and it took some getting used to. Conrad Fisher the boy she had liked forever, the boy who wouldn't even take a glimpse in her direction, the boy who doesn't pay one bit attention to her, is now looking her way, and paying attention to her its exhilarating  but also very nerve-racking. But she gets mixed in with her feelings when she catches herself glimpsing at Conrad's brother Jerimiah, she starts to realise that she may like him as well, now she's lost in a great big mind game, which one does she like better, what is she going to do now she breaks some hearts, she gets her heart broken, and she falls in love.

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Belly_Conklin

Conrad is a straight A student, also a star athlete, Conrad has always been Responsible and serious. The boy who Belly has loved for many years, Belly arrives at his familys summer house just to discover for some weird reason Conrad has become distant and moody, something has changed in him but she dosent know why he has started acting out. Conrad has seemed to always have the answers for everything, the smart confident kid who always had something to say, but now he is shut off and in his senior year off college having a hard time asking others for help. Conrad has to fight for his love for Belly, through his brother Jerimiah who shares the same feelings for Belly, he is lost, he is wondering whether he is being played with or Belly really loves him?

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Conrad_Fisher

Jeremiah is a popular, athletic, outgoing, easy going person to be around. Giving off Golden retriever energy, him an belly have been best friends since they were kids, he has never failed to make Belly smile. He is incredibly flirty and is a magnet to girls, and does not fail to be a gentleman and offer people his services. His life is all about the party life and he gives of a I don't care attitude all throughout the movie, but his and Belly's relationship took an unexpected turn when they caught feelings for each other while Belly was lost between whether she has feelings for Conrad Jeremiah's brother or Jeremiah.

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Jeremiah_Fisher

Steven Belly's brother was often fighting and bickering with Belly they were very close siblings but often despised each other, always fighting with each other and making each other so frustrated. Steven Is quite close with Conrad and Jeremiah. Steven is a high achiever who is quite handsome and has high dreams, he is ready to leave his home town when he finishes high school for his future. 

Steven had his first relation ship with a girl named Shayla Wang, A city girl from a wealthy family, Shayla helped Steven when he was in a rough place and was struggling with financial struggles, Shayla is Belly's fellow debutante, She is confident cool and has a soft spot for fashion.

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Steven_Conklin

Laurel is the mother of both Belly and Steven, she used to have a husband in the picture but divorced him early in the children's life. She is Susannah's best friend even though they do not have any biological relations they still considerate eacother sisters from all they have been through. Laurel can be very buisness like and formal, she has a good relationship with Belly but sometimes they do not get along. She is also like a second mum to Jeremiah and Conrad.

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Laurel_Dunne_(Book_Character)

Susannah is the mother of Conrad and Jeremiah she is a warm-harted , free-spirit. Susannah is Laurels best friend who as mentioned is the mother of Belly and Steven. Susannah is laurels best friend who hosts the two families every summer in her luxurious beach town home. 

She has always seen Belly as the daughter that she never had and some day she secretly hopes that Belly will marry one of her boys.

https://thesummeriturnedprettytrilogy.fandom.com/wiki/Susannah_Fisher