Top 10 Cartoon Protagonists that Went Downhill

Cartoon Protagonists/ main characters that went downhill over time. I'll only be including cartoon protagonists for this list. Not side characters or antagonists. Like always if I missed one feel free to add it.
The Top Ten
1 Timmy Turner - Fairly Odd Parents Timothy "Timmy" Tiberius Turner is a ten-year old boy who is a fictional character and the main protagonist of the American animated series The Fairly OddParents created by Butch Hartman for Nickelodeon.

The whole show is basically dead and Timmy is an ungrateful brat. I'm Actually glad that Butch Hartman left nickelodeon. This show needs to get cancelled

I'm glad I stopped watching. After watching this as a kid, I can't bear to see him today! It's a disgrace. One of Butch's creations ruined.

2 Brian Griffin - Family Guy Brian H. Griffin, popularly known without his middle initial as Brian Griffin, is a fictional character from the animated television series Family Guy.

I disagree because his political views are mostly good and he's the open mind in this wirld. He added quite a bit of depth to the series while still remaining funny. That he sometimes acts completely out of character is solely for humorous effect and not canon.

But then, the German market is a few years behind, and furthermore, I am a few years behind the current episode in Germany. Maybe in the meantime he became horrible.

He is not really a bad character but sometimes he can be a huge smart alec.

3 Peter Griffin - Family Guy Peter Griffin is the main protagonist and titular character of the American animated sitcom Family Guy.

He went from being a good father to being an idiot. Don't believe me watch the newer episodes. He beats up random people for no actual reason and tortures his kids ( Especially Meg ) He really deserves to be in jail.

4 Cosmo - Fairly Odd Parents Cosmo is Timmy fairy godfather. He's Wanda's husband and Poof's dad. Cosmo is very immature and stupid, but also very charming and a loving father, godfather and husband.
5 Wanda - The Fairly Oddparents

How?

6 Lois Griffin - Family Guy Lois Patrice Griffin is one of the main characters of the American animated television series Family Guy.
7 Patrick Star - Spongebob Squarepants Patrick Star is a fictional character in the American animated television series SpongeBob SquarePants, and he is one of the 10 main characters in the show. He is voiced by actor Bill Fagerbakke, who also voices numerous other characters on the show. Created and designed by marine biologist and cartoonist Stephen Hillenburg, the series creator, Patrick first appeared on television in the show's pilot episode "Help Wanted" on May 1, 1999. ...read more.

Okay, Patrick has gotten better as of season 10, but seasons 6-9 Patrick was awful.

8 Zane - Lego Ninjago

Bringing him back in Season 4 was unnecesary and only to make money, he also acted way more robot in the later seasons which was awful because he was suppose to be a smart robot who acts human!

9 Sensei Wu - Lego Ninjago

He's still decent in my opinion, just underused

10 Stan Smith - American Dad Stanford Leonard "Stan" Smith is the main protagonist of the adult animated sitcom American Dad!. He is voiced by the series' co-creator and executive producer, Seth MacFarlane.
The Contenders
11 Jay Walker - Ninjago

Went from a funny comic relief to an annoying gamer

12 Uncle Ruckus - The Boondocks
13 Francine Smith - American Dad
14 Peppa Pig - Peppa Pig
15 Peggy Hill - King of the Hill Margaret Joseph "Peggy" Hill is a fictional character in the American animated series King of the Hill.
16 Astro Boy - Astro Boy
17 Lincoln Loud - The Loud House
18 Goku - Dragon Ball Z Son Goku (Kakarrot) is the main protagonist in Dragon Ball franchise created by Akira Toriyama in 1984. He has many abilities like, super strength, utilization of ki, flight, teleportation, super speed, enhanced reflexes, and Super Saiyan transformation that increase strength, speed, and durability. ...read more.
19 Homer Simpson - The Simpsons Homer Jay Simpson is the main protagonist of the American animated television series The Simpsons as the patriarch of the eponymous family.
20 Steve Smith - American Dad Anita "Steve" Smith is a fictional character in the animated television series American Dad!, voiced by Scott Grimes.
21 Hayley Smith - American Dad
22 Numbuh 1 - Codename: Kids Next Door
23 Luna Loud - The Loud House Luna Loud is the 3rd oldest sister, Luna's life forever changed following her first concert which started her passion and dream of being a rock star, Luna's personality can best be described as wild, caring and the loudest of the Louds like Leni she's very caring and enjoys being around the company ...read more.
24 Lisa Simpson - The Simpsons Lisa Marie Simpson is a fictional character in the animated television series The Simpsons. She is the middle child and most intelligent of the Simpson family.
25 Philip J. Fry - Futurama Philip J. Fry, or more commonly called Fry, is the main protagonist of Futurama. He is voiced by Billy West.
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