An evil laugh is a typical of a antagonist in a story, since they are usually characterized as dark and merciless people. This laugh is often used when displaying a show of power; it seems to give the character in use a malevolent feeling at times, making the mood more dark or angsty.
-Buahahahahahaha
-Muahahahahahaha
-Zehahahahahaha (Blackbeard from One Piece)
These are all examples of an evil laugh.
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