Considering all the db series, the weakest villain by far as far as brute strength is concerned would be pilaf by far. He is weaker than the average human and is quite on the low IQ. read more
If we’re restricting it to villains who were ever relevant in Dragon Ball Z specifically, I’ve gotta say the Saibamen. Each one had the power level of the lowly Raditz, whom even someone like Yamcha, Yajirobe, or Chiaotzu could effortlessly kill with a single shot. read more
They can also be from Dragon Ball, Dragon Ball Z or any of the various movies; any loser warrior is welcome. To be clear, this is Dragon Ball’s weakest fighters. That means characters that don’t enter the fray don’t enter the running for this list. read more
The primary villain in the Future Trunks saga of Dragon Ball Super, Goku Black is one of the toughest warriors the Z-Fighters ever had to face. Zamusa, an apprentice of the Supreme Kai and likely the strongest Kai to ever live, stole Goku's body from an alternate timeline and used his power to destroy all life. read more