The Patakis would be amazing.
We would get to see more about Helga's family, analyse their characters and understand their actions! (Not justify them of course)
We would get Helga being herself but in more screen-time and as teenager, being more mature.
We would have Helga and Phoebe's friendship be more meaningful and Gerald and Phoebe's cute relationship! (And i hope Helga and Gerald's friendship)
Helga would be the star!
I love the idea of her and Arnold being apart only to get back together again. It would be so real! Also, we could see more depth about Arnold's feelings for her.
The only thing that it made sense but i didn't like it very much was The Patakis family designs. Don't get me wrong, they were accurate, but i just feel like we could make Helga more like a teenager with something in her changed than her just being taller with boobs.