Has to be Lobo, seeing as he's banned from death.
Though even without his immortality, he'd still win the vast majority. To start with while Trunks is faster Lobo has the reactions to track him, and while Trunks' blasts are more destructive Lobo is not far behind and has the durability to withstand. And on that, he also comes with regeneration a good deal above either Cell or Buu. Trunks would have the hardest time keeping him down, something that wouldn't happen for Lobo's advances.
Then again with enough force Trunks may be able to KO him for a while.
Originally posted by StealthRangerHow would he even touch them hell Kid buu, Super Buu, and Majin Buu could just turn him into chocolate and eat him there no way he could solo.
Lobo rapestomps. If he can tank Superman's hits and regen from vaporisation in seconds, what is Trunks goin' to do?Hell, wouldn't surprise me if Lobo could solo DBZ