Dragon Ball: the Mysterious Teacher

Porter traveled through time and became a Saiyan, turning on the "teacher" system. As long as you guide a student, you will have 50 times the normal combat power of this student. At the beginning, he guided the 5-year-old Vegeta to successfully transform into a Super Saiyan. From then on, Porter embarked on the road to peace. As Vegeta becomes stronger, Porter's normal combat power increases by 50 times on its own, and it can also increase by 50 times when he becomes a Super Sailor. … Some years later. Porter: "Bardos, be my student!"