Obi-Wan Kenobi

Well, duh. We’ve got a separate massive article on the titular character but the basics are this: years ago, Jedi Master Obi-Wan Kenobi took a young Jedi named Anakin Skywalker as his Padawan. Many adventures later, Anakin Skywalker betrayed Obi-Wan and the Jedi Order, becoming Darth Vader. However, what Vader didn’t know was that his late wife, Padmé, had two children before her death: Luke and Leia. Obi-Wan, with the help of Yoda and Senator Bail Organa, hid the children, sending Leia with Organa to Alderaan, while he brought Luke to Tatooine.
About 20 years later, a pair of droids arrived on Tatooine calling a now elderly Obi-Wan into action to help Leia, and he recruited Luke for the task. Obi-Wan would eventually meet his end at the hands of Vader, becoming one with the Force.
This show takes place in between that, with a Luke who is about 10 years old.