Name TV sitcom characters who were kinda uncool and dorks by the beginning of the series run but turned out to be more cool and popular by the series end.

I always thought Paul of the wonder years got cooler later one in the series

Billy from "Power Rangers"
Steve Urkel from "Family Matters" when he'd morph into his alter ego.
Latka Gravas from "Taxi" would become Vic Ferrari.
Ron Johnson from "A Different World". He was a spineless jellyfish turn womanizing, chauvanistic, opinionated, class clown.

When Arnold J Rimmer took over as Ace Rimmer in Red Dwarf Series 7.

Topanga from Boy Meets World

Quinn Mallory from "Sliders."