For starters, for those who are unfamiliar with the term "Flanderization" (https://tvtropes.org/pmwiki/pmwiki.php/Main/Flanderization):
Flanderization (https://en.wikipedia.org/wiki/Flanderization#:~:text=Flanderization%20is%20the%20process%20through%20which%20a%20single%20element%20of,becomes%20their%20primary%20defining%20characteristic.) is the process through which a single element of a character's personality, often an originally mild element, is inflated in importance over the course of a work until it becomes their primary (https://www.urbandictionary.com/define.php?term=Flanderization) defining characteristic.

In other words, shows especially comedies, that take a character, and gradually make the character wackier over time. But how many times on shows have the characters either stayed consistent or went the other way and got more serious and dimensional?

When Boy Meets World first started Eric was a pretty smart guy. Then the later seasons they made him as dumb as a brick. I hated that they made him so stupid.

In Happy Days, they gradually made Richie, Potsie and Ralph dumber as the seasons went on. From normal to idiots.

In Happy Days, they gradually made Richie, Potsie and Ralph dumber as the seasons went on. From normal to idiots.Potsie I agree with. I sure don't remember Richie being an idiot though..

Bubba Higgins on Mama's Family

"Kookie" Kookson on 77 Sunset Strip -- becomes a regular investigator, where earlier he was a wisecracking parking attendant.

When Boy Meets World first started Eric was a pretty smart guy. Then the later seasons they made him as dumb as a brick. I hated that they made him so stupid.

Keep in mind, that I'm specifically referring to a reversal of that concept. Like if a character actually matures and becomes more well-rounded and developed as the series continues rather than becoming a one-note caricature.