Rick And Morty: 10 Most Dangerous Villains
6. Fart
Fart (having adopted its own name following an insult from Rick) would probably top this list in terms of sheer kill count.
When we first meet Fart, who bears a slight resemblance to the Dikironium cloud creature from Star Trek, it's as Krombopulos Michael attempts to assassinate him with an anti-matter gun. Purchased, conveniently, from Rick.
Oh boy, here I go killing again!
Morty, no fan of Rick's side hustle as an arm's dealer, attempts to be a positive force in the universe by saving Fart's life. That results in Fart befriending Morty, but their subsequent escape is a bloody one, with the deaths of untold numbers of police and civilians — and to top it off, Fart tells Morty that after heading back to his own dimension, he intends to return with more of his kind and wipe out all carbon-based life (including humans, of course), which he sees as a threat to higher lifeforms like himself.
Plenty of clouds may rain on your parade, but that right there is a deal downer. It also forces Morty's hand: instead of delivering Fart home through a wormhole back to his own dimension, he delivers the gaseous cloud to his maker, pulling the trigger on the anti-matter gun himself.