Fuzzys are usually Spiky Balls with Eyes and a Mouth. There are many Color variants of Fuzzies, which not only Vary in color, But in power also.
Fuzzys usually hop from one area to another and absorb health from the player by Biting the player. More Intelligent Fuzzies are usually Thieves, these more intelligent Fuzzies appear in Paper Mario stealing Shells from Koopas.
New Super Mario Bros D.I.Y.
Fuzzies appear in New Super Mario Bros D.I.Y. as an enemy. In the game, they their behaviour in Super Paper Mario.