What is a good example of a character that got progressively more dumb over the course of the show?

The original post: /r/television by /u/jford1994 on 2024-04-25 19:52:37.

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Best examples off the top of my head:

Joey - Friends

Kevin Malone - The Office

Mac - It’s Always Sunny in Philadelphia

Edit: For everyone mentioning Charlie or anyone from IASIP, this is what I have to say about the show, in a very long-winded way