Annoyers are small, black bats. They generally remain dormant until a victim gets close, where they will then approach slowly, but then circle rapidly (and annoyingly) around the target. They do damage by circling close as the victim is trying to move. They can be defeated in a single hit..
There is a fire variant of the Annoyers, with red eyes instead of white eyes. They move as a normal Annoyer does, shooting fireballs at a victim. It takes two hits to kill one. The first time one is it, it will generally move away from the victim, while it continues to shoot fireballs.