In Star Wars The Clone Wars, the character of Ahsoka Tano started out as very young, inexperienced, snippy, and annoying to some fans. But this character developed so much that she became a fan favorite. She is my favorite as well.
Then a much more mature Ahsoka Tano occasionally popped up in the Star Wars Rebels sequel series.
Rumor has it that the appearance of this animated character in the live-action Mandalorian is a prelude to an Ahsoka Tano series. The ending of Star Wars Rebels implies that there is more to be done with this character, as the series ends on a cliffhanger. Check out the last 2 minutes of the Star Wars Rebels series: