Cosmo and Wanda (seasons 1-8)

Cosmo and Wanda are the titular deuteragonists in The Fairly OddParents. They are the godparents of Timmy Turner. They also have a baby boy named Poof, after Timmy wished for them to have a child together. They are voiced by Daran Norris and Susan Blakslee, respectively.

Both

 * 1) Unlike Timmy's real parents, they are a lot more caring and love Timmy and make sure to satisfy and keep him happy, but they will make sure to do what is right and are also strict and will follow Da Rules, so they can make sure that Timmy can't have everything go his way.
 * 2) They give Timmy good advice about how some of his wishes might backfire and might not work.
 * 3) Despite their contrasting personalities and their tendencies to argue, they stay married and have a good relationship. Wanda usually acts as the mind (and the bravery) while Cosmo acts as the fun.
 * 4) Before Poof, they served as father and mother-like figures towards Timmy.

Cosmo

 * 1) He is carefree and happy-go-lucky and always wants to make sure that Timmy has fun.
 * 2) Daran Norris does a flawless job voicing him in the original Oh Yeah! Cartoons and the first two seasons of the show.
 * 3) *Speaking of the aforementioned original pilot shorts, he was originally written and portrayed as laidback and intelligent, and spoke in a suave, car salesman-like voice before he was dumb down in the green lighted series, but still kept his overall charm for the most part.
 * 4) His stupidity is very charming and funny and contributes to some of the show's funniest moments. Despite this, he is still self-aware and proved several times that he can be responsible and tried to help, such as in "Abra-Catastrophe!" where he tried to save Wanda from Mr. Crocker and in "Wanda's Day Off!" where he tried to prove to Wanda that he can be an independent parent to Timmy while she is temporarily away from them.
 * 5) He always defends Wanda and gets jealous of Juandissimo, Wanda’s ex, and stand up towards those who insult her like Mama Cosma (his mom).
 * 6) He is noted to be one of the most powerful fairies ever, seeing as he blew up all of Fairy World in the first 5 seconds after he was born, sunk Atlantis 9 times, destroyed Fairy World again 5 more times, caused Mt. Vesuvius to erupt and destroy Pompeii, transformed Xanadu into Pittsburg, summoned up a gigantic three-headed hydra, whom he dubbed "Snowball", with one careless wave of his wand, and was able to accidentally wish away Wanda's wand and make wands in "Wishology", which is something that it is said that fairies cannot do when they say that magic cannot wish away magic. These actions would make the fairies decide not to have any more children until Poof was born ten thousand years later.
 * 7) He and Poof have a good relationship like a young father and infant son would have. Poof refers to Cosmo as "Dada" and somewhat recognizes his father's stupidity, but loves him with all his heart.

Wanda

 * 1) She is probably the most smartest character in the show along with AJ.
 * 2) Susan Blakeslee does a great job voicing her.
 * 3) She is also very responsible and won’t grant dumb wishes that Timmy wishes for since she knows that those wishes will turn wrong.
 * 4) She can also use her swirly hair to fight others as shown in "Planet Poof".
 * 5) She acts like a Mama Bear whenever Timmy, Poof, and Cosmo are in danger.
 * 6) Wanda is a lot more reasonable and a lot more strict in comparison to Cosmo and will make sure that Timmy must follow rules and always looks after him to make sure that he is alright.

Both

 * 1) Unfortunately, they were flanderized in Seasons 9 & 10, becoming a generic idiotic husband and nagging wife stereotypes who frequently lose their wands for what can only be described as plot contrivance.
 * 2) *It also varies whether they were in character or not in Seasons 6-8. For example, following Poof's introduction, Cosmo and Wanda have became less empathetic towards Timmy in several cases, with the offending episode being "Lights Out", where they repeatedly tried to kill Timmy throughout that episode for a petty reason: because he read Poof a scary bedtime story.
 * 3) *Another example is "Bad Heir Day", where it was severely out of character for Wanda to have gotten so mad at Timmy even though it was clear he'd risked his life to protect Poof. However, he again did put his guard down, and try to do fun (and dangerous) stuff with Poof, similar to "Mission Responsible". Yes, Timmy did deserve to be punished, but Wanda should not have been allowed to poof Timmy to the alligators as punishment since fairies have to keep their godchildren safe, not put them in danger on purpose.
 * 4) Their squabbling can be too much to deal with.
 * 5) In Season 5, the writers often wrote a lot of mean-spirited and unfunny jokes surrounding their marriage, which makes the dynamic between the duo not very charming and loving. Thankfully, once Poof came aboard in Season 6, Cosmo and Wanda were revamped into being loving godparents.

Cosmo

 * 1) His stupidity can be annoying, unfunny and troublesome at times.
 * 2) His high-pitched voice from Season 3 to Season 8 is kinda annoying as well, since it was either the executives at Nickelodeon or series creator Butch Hartman wanting to dumb Cosmo down as the show progressed.

Wanda

 * 1) She can be a little too strict and cautious at times.