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No, Ahsoka doesn't have any sentimental relationships in Star Wars: The Clone Wars
Ahsoka Tano is voiced by Ashley Eckstein
Ahsoka Tano returns in season six, but only for a moment as a vision from Yoda.
Ahsoka Tano is 14 years old at the start of "Star Wars: The Clone Wars" and around 17 years old by the end of the series.
Dave Filoni; the director on Star Wars the Clone Wars
Ahsoka Tano changed Togruta outfits during the course of Star Wars: The Clone Wars. But, both her outfits were a shade of brown.
The name of his apprentice is Ahsoka Tano
Ahsoka Tano served as Skywalker's Padawan during the Clone Wars.
[Spoilers] No
If you mean Ahsoka Tano, then she is the Padawan apprentice to Anakin Skywalker in Star Wars: The Clone Wars animated movie and following animated series.
Rex's fate is a mystery to be revealed. As is Ahsoka Tano.