Brainiac/YMMV


 * Complete Monster: One thing that is consistent with the character is that he is a remorseless mass murderer responsible for atrocities on, and sometimes the annihilation of, entire worlds throughout the cosmos, all For Science! of course, if by "science" we mean for his own private collection or to sate his megalomania. Not to mention the lengths he'll go to in the name of murderous vengeance, especially against Superman, such as  for thwarting his evil schemes.