Devil

The Devil, known as the Demon in the PAL version of the game, is an Assist Trophy in Super Smash Bros. Brawl. The devil will not affect any of the players, but instead he will affect the stage. The devil will point left or right (up and down is uncertain) and have the stage move in that direction until barely any of it is left seen on the screen.

This will most likely bring chaos as well as new strategies as to survive this "Assist" Trophy.

Origin
The Devil comes from a game called Devil World, a game published by Nintendo for the NES. In the game, you play as Tamagon in a way similar to pacman. It is the Devil that makes the game difficult by directing the way the screen moves the same way he will in Super Smash Bros. Brawl.