I'm going to get a lot of hate for this but I like Tori Scott - I found it odd that the kids never had any friends outside of the main group, that was not the case in Highschool a lot of people between 8th grade and high school do not remain friends (they move, some become jocks becoming friends with team mates)

Having Tori show up and having her become friends with everyone but Kelly and Jessie made sense (yes I know in real life Kelly and Jessie departed the show, but in universe they were still at bayside and was still friends with Zack and the others)

For me, it's gotta be Zack Morris. He was the heart and soul of Saved by the Bell — charismatic, witty, and always a step ahead with his schemes. His knack for breaking the fourth wall made the show feel like a personal conversation with us, and even though he was mischievous, he always managed to bring the gang together when it mattered most. Every character had their own charm. Zack's unique blend of humor and leadership is what made the series unforgettable to me.