Darth Vader is a Premium Box Tsum. For a limited time on the Japanese version only, while he was first introduced, he would be a musical Tsum and play the song "Imperial March" during game play. He is a Limited Time Event Tsum and is not obtainable through purchasing Premium Boxes outside of the event.
Darth Vader will clear areas of Tsums along the direction you trace. Make slower traces for larger clears. His base radius size is S and the base number required to fill his skill meter is 22. Higher skill levels reduce the number required.
Making slower lines will create broader clear areas. To get the most out of Darth Vader, turn Gyro on, and tilt your device.
Skill Level Edit
|Number to Fill Skill Meter||Radius||Skill Upgrade|