There are multiple episodes where a character is portrayed as a "strangler," but it's always done in a comedic and exaggerated way, usually as a part of a joke or a misunderstanding.
Here are some examples:
* "The Algae's Always Greener": SpongeBob mistakenly believes Squidward's life is better and tries to strangle him with a rope to get his job.
* "The Original Fry Cook": Plankton attempts to strangle SpongeBob with a metal cable, but SpongeBob easily escapes.
* "Shanghaied": SpongeBob believes Plankton has kidnapped Gary and tries to strangle him, but it turns out to be a misunderstanding.
It's important to note that these instances of "strangling" are always played for laughs and never intended to be taken seriously.
If you're looking for a specific character who consistently acts as a "strangler" in SpongeBob, there isn't one. The concept is more of a running gag than a character trait.