Everyone & Jenni

Overview
Throughout the series, Jenni has developed with her social experiences throughout her time at Brewster High. Her friendly attitude led her to befriend almost everyone. Her only major conflicts are with mean-spirited people such as Samara. Overall, Jenni has gained amazing friendships with majority of the students and went out of her way to help them succeed in their respective goals.

Zachary
Jenni and Zachary has a close friendship going way back to Elementary School. They formed the idea of creating their band together, originally making it a duo, before recruiting Ava. It's shown that they have each others backs several times throughout the series. They have several moments where Zachary expresses his love for her, but eventually keeps the friendship from being broken.

Ava
Jenni and Ava have a straight-forward close friendship, also going way back to Elementary School. She was recruited by Jenni and Zachary to join their group as a guitarist. Several times throughout the show, Ava would be blunt and direct with Jenni, leaving her to have so much respect for her. Later, when Ava reveals that she can't sing, due to her illness, Jenni goes out of her way to help her recover and pass.

Michael
Upon meeting, Jenni and Michael develops a close and professional friendship with each other. They show that they appreciate each others talents and perspectives of life, despite having opposite views of the world. Jenni, later does develop a crush for him, which could get her into some trouble later on, but chooses to keep it professional.

James
James and Jenni did not interact as much when they met, but once James saw the injustice and racial discrimination that occurred in the drama class, the unfortunate experience brought the two together. I guess you could say that their friendship grows from similar experiences with racism and both decides to tackle the issues to make the school better.

Samara
Samara is Jenni's true rival and only major conflict throughout the series. Samara finds her a true threat to her goals, which fueled from the moment they first met. Throughout the series, there has never been a moment where they showed any true signs of kindness to each other. They constantly fight and compete over roles or spots in school plays, events and showcases to be the main Alpha performer.

Frank
Jenni has a loving relationship with her father. After her mother passed, their relationship grew stronger and they always supported each other. It's shown in the Pilot episode, Jenni takes care of his health while he is down and later in the series, they call each other everyday, which shows how close they are. Their dynamic is shown to be much stronger when he provides advices for her throughout her journey.