User blog comment:SSWerty/Dragon Ball ST/@comment-210.11.95.225-20100828025252

If you want a strong bad character I would call him Unknown Super Saiyan so he might have transformations like Super Saiyan 1, 2, 3, 4, 5, 6, 7, 8, 9 and you can make a final transformation like Ultimate Super Saiyan. One more transformation you can make is Ultimate Kaioken which is the same but with dark green aura.