Champ and Lewis can't hurt people on a large scale like Griffith or Ramsay can, and I think I would kill Femto because Ramsay is, while a very powerful one due to his status, still just a human, while Femto is a literal god.

Yeah, killing Griffith in his current state would be definitely a feat. Also, is this, essentialy, the "Which rapist do you hate the most" poll?