STAR WARS: VENGEANCE WASTED (or what should it be called) (Disney+ Series)

Star Wars spinoff centered around a background character

At one point in the "Obi-Wan Kenobi" series, Darth Vader was walking down a street in a Tatooine town, facing off against Obi-Wan, and he merely caused a casualty and one kid watched in horror his parent get hurt. The boy, Ken Starrunner, was traumatized that his parent died and since then, he vowed vengeance. He spends the next fifteen years training to be a brutal assassin, hoping to kill Darth Vader and avenge his parent. But, unfortunately, by the time his training was completed, Darth Vader was ALREADY dead, and the war against the Empire was over. Now, Ken is really upset he never reached the goal he hoped to achieve since he was a kid. He sets out across the galaxy as a nomad trying to find a new purpose. Alongside his droid friend, ENT-17. At one point, Ken and ENT-17 explore the wreck of the second Death Star.