Plutons are enemies from Kid Icarus.
Plutons are a race of thieving ogres. They first appear in the second world, and attempt to separate Pit from his helpful enchanted weapons. If they get their hands on Pit, they will steal one of the available weapons and trade it to a black marketeer, who will sell the stolen goods back to you at a hefty price. Plutons are invulnerable to Pit's attacks and cannot be defeated.