Mischievous Jack is a Premium Box Tsum. He is currently only available on the Japanese version. He is a limited event Tsum and is not available from purchasing Premium Boxes outside of the event. He was introduced during the Japan Event Score Challenge (October 2018).
Mischievous Jack will clear random Tsums and also create a special Pumpkin Bomb. His base number cleared is 16 and his base Bomb size is SS.