Season Education season 4 saw a number of key characters absent from the final season while introducing some exciting new additions. The series does a great job of giving characters a chance to shine, but some managed to go the extra mile and become immediate favorites, whether because of their sympathetic and relatable storylines, their undeniable warmth and charm, or a combination of both factors. The best Sex Education characters enriched the series and made it better with their presence.

20 O

Thaddea Graham

There were a number of new characters in Sex Education season 4, but O (Thaddea Graham) had one of the biggest roles. She served as a great antagonist for Otis for most of the season as the established and very successful sex therapist on the new campus and their battle made for some great moments. She seemed like she would be an easy character to dislike as she was not only a worthy adversary to Otis, but her past bullying towards Ruby was revealed.

However, like many characters in the series, O was shown to be a more complex character dealing with her own loneliness and identity issues. In the end, the show allowed her redemption while also itting she was the better therapist.

19 Abbi

Anthony Lexa

Season 4 of Sex Education also sees the main cast move to a new high school following the closing of Mooredale. The new school, Cavendish, is a more inclusive and positive environment and a lot of that seems to be spearheaded by Abbi (Anthony Lexa), the popular girl in school. Some of the original Mooredale team have a hard time fitting in with Abbi, and even her close friends are bothered by her relentless positivity at times. However, she also proves to be a very caring person, organizing her classmates for worthy causes and being a genuinely helpful guide to Eric as he deals with his issues of faith and sexuality.

18 Maureen Groff

Samantha Spiro

Maureen Groff (Samantha Spiro) was one of the adult Sex Education characters who got the chance to have her own fleshed-out storyline. Realizing that she was in a loveless marriage, Maureen spoke with Jean and decided that she needed to make drastic changes. Maureen proved how strong she was by divorcing the grumpy and uncompromising Michael. She is also a great mother as she saw that her son was dating another man, but let him come to her with the truth about his sexuality when he was ready. Unfortunately, season 4 diminishes her role somewhat, not showing her friendship with Jean and reuniting her with Michael.

17 Aisha

Alexandra James

Aisha (Alexandra James) is another one of the new Cavendish students who are introduced in Sex Education season 4. As a deaf student, Aisha struggles with sometimes being overlooked or her needs being forgotten by those around her, but she is also brave enough to speak her mind when needed. Aisha develops a romantic relationship with Cal over the course of the final season, showing comion and kindness to them as they struggle with their own personal challenges. She is a leader among her fellow students while also being a typical teen who pushes back against Abbi's imposing rules about remaining positive.

16 Olivia Hanan

Simone Ashley

At the start of the show, Olivia Hanan (Simone Ashley) doesn't seem like the kind of character who will find a way to stand out. She's a member of "The Untouchables" and just came across as a popular girl who could be mean to the main characters. Of course, she proved there was more to her than that. Olivia played a main part in one of Sex Education's best episodes, which centered on a group of girls coming together through their shared experiences of harrowing sexual assault. Although she doesn't get a ton of screen time, Olivia delivers laughs while being a sympathetic character.

15 Joanna

In addition to the new students introduced in Sex Education season 4, there is also the introduction of Jean's sister Joanna. Though Joanna is called in by Otis to help out with the new baby, her life is in its own form of chaos as well. With failed relationships, reckless behavior, and crushing debt, there is something very entertaining about Joanna's wild energy. Her combative relationship with her sister also brings out the sillier side of Jean with some hilarious moments together. However, one of the best moments in season 4 is Joanna calling into Jean's talk show to allow the sisters to have an honest and healing conversation.

14 Viv Odusanya

Chinenye Ezeudu

Viv Odusanya (Chinenye Ezeudu) was a new addition to the cast during season 2. She is a genius who bonds with Jackson as she tutors him, but they also become close friends. Viv may come across as a bit robotic and lacking social skills at first, but she is clearly a caring individual as evidenced by her telling Jackson's parents about his self-harm. Viv's season 3 arc was a bit harmful to her reputation, as she sided with the restrictive heaster at the expense of her fellow students. However, season 4 sees her back as Jackson's best friend while also dealing with her obsessive love interest in a strong and intelligent way.

13 Isaac

George Robinson

Isaac (George Robinson) was another character who was introduced seemingly for the audience to quickly turn against. He is a young man living in the same caravan park as Maeve who quickly develops a rapport with her. However, he also becomes a hindrance to Otis and Maeve's romance. Luckily, Isaac quickly shows he's not the villain of the series, itting to his wrongdoing and making amends with Maeve. It is in season 4, however, that Isaac truly becomes one of the best characters as he leads a school rebellion to make Cavendish more accessible while starting a charming romance with Aimee.

12 Michael Groff

Alistair Petrie

During the show's first two seasons, Michael Groff (Alistair Petrie) was incredibly unlikeable. He was overly strict and uptight and did terrible things. That included bullying his son, completely ignoring his wife, and framing Jean by releasing all of her private notes about conversations with the students. However, he had the beginnings of his redemption in season 3, when Michael hit rock bottom after getting fired and going through a divorce. Season 4 continued Michael's redemption arc as he takes responsibility for his behavior, showing humility and taking steps to mend his relationship with Adam.

11 Cal Bowman

Due Saleh

Sex Education was lauded for its high level of LGBTQ+ representation. It features gay, lesbian, bisexual, pansexual, asexual characters, and more. Season 3 introduced Cal Bowman (Dua Saleh), the show's first non-binary character. Cal brought something different to the show thanks to their American background and laid-back attitude. They were able to get Jackson to chill out a bit more and they stood up to Hope and her antiquated views on gender roles. Season 4 saw Cal's transitioning storyline take the spotlight with their honest and challenging struggle not giving any easy answers, but continuing to show Cal as a strong person who is embracing the path they want in life.