The Evil Bug is a minor villain in The All New Fairly OddParents!. He's a small bug that was created by a scientist as an experiment and is the main cause of Vicky being evil.
The creature was created by a scientist who wanted to make an evil creature by combining the DNA of the world's most evil animals. Upon seeing the result, the scientist thought the experiment was a failure.
Its appearance is a black stag beetle with red eyes, large pincers and a white skull on its abdomen. Using its pinches, it can attach itself to the buttocks of any person it chooses, causing them to become evil. If the bug is removed from the current host it is in, it will search for a new host. It's deceptively durable, much like cockroaches, due to it also having cockroach DNA. Because of this, the Evil Bug cannot be destroyed by magic.