Greevil is green like the devil.
Greevil is a green buzzer whom appeared from out of the blue in the first episode and scared both Sedrick and Duncan silly. After a cute wink from the thing Duncan quickly warmed up to the green buzzer and made friends with him, but Sedrick was not convinced. They decided to name him Greevil because he was green... and evil... like the devil.
In later episodes Greevil is of the three main characters and is mostly like Duncan's friend and an annoyance to Sedrick. He is cute and childish for the most part, but can suddenly show a more menecing side when he is brewing poison and tries to make it into Sedrick's food.
Greevil is small green and has a waterdropped formed head. His buzz is the most high pitched of all the buzzers.