The bat may be a basic enemy but it has been present through a lot of games. They hang down from the ceiling and attack once the hero draws near enough. Having said this, they've also been known to fly in from one side and out the other and even through windows. They aren't quick and can only attack through biting, but they are effective in groups.
A bloodsucking bat that lurks in the dark
Entry No. 001
Weak: Strike, Fire
Flight: The bat will take flight from it's perch, flowing in a drunken wave toward the protagonist. It can either be avoided, or hit with a weapon. One hit will take it out as it only has one HP.