Lifty and Shifty are both one of the main characters in Happy Tree Friends.
Lifty and his brother Shifty are two green kleptomaniac raccoon identical twin brothers with dark green mask-like markings around their eyes. They frequently steal merchandise and produce from the other Happy Tree Friends (thus their names), as well as treasure hunting, ransacking houses or anything to get rich quick with the exception of Flaky,Lammy, Cro-Marmot and Splendid. They mostly steal from Lumpy (in Meat Me for Lunch they stole meat from Lumpy's deli mart, in Milkin' It they stole a cow from Lumpy's farm, in Concrete Solution they stole his wallet, and inJunk in the Trunk they abducted his pet elephant). They probably rob Lumpy so frequently because his lack of intelligence and common sense makes him an easy target.
- Happy Tree Friends Wiki