Melvin Sneedly (voiced by Jorge Diaz in the TV show and by Jordan Peele in the movie) is the central antagonist of the Captain Underpants series.  Melvin is incredibly smart, but is also a tattletale, which often puts him at odds with his fellow classmates, including Harold Hutchins.  There is some variation in Melvin’s costume, depending on which version you choose, but he always wears oversized glasses and a bow tie.

In Us, Pluto is the tethered character for Jason Wilson (Evan Alex). He is Jason’s doppelganger who, along with a red jumpsuit, wears a white mask to hide the extensive burn scars on his face. Jason realizes that Pluto mirrors his movements, and figures out a way to use that to his advantage when Pluto and the rest of his group intrude the Wilson’s home and hold them captive.