Because all Anti-Fairies are the opposite of their fairy counterparts, instead of being smart and hot tempered like Wanda, Anti-Wanda is dimwitted and always happy, just like Cosmo. Her IQ is so low that she doesn't know how to eat properly, and as such she eats with her feet (instead of her hands like normal people), and much like Cosmo, she foils plans without knowing what's going on (Anti-Wanda may also be even more stupid than Cosmo as shown in some episodes). She has a few missing teeth and speaks in a hillbilly and county Southern accent.
Anti-Wanda resembles Wanda, but her color scheme is dark blue and black. She has bat wings and a black crown like all Anti-Fairies. She has pink eyes like Wanda, although she has missing teeth and the rest of her teeth are crooked. She also does not wear any shoes because she uses her feet to eat sandwiches.
Anti-Wanda speaks in a southern hillbilly accent and eats with her feet. Her stupidity is often the cause of trouble for Timmy and her husband. It is unclear whether or not Anti-Wanda is a real threat, because usually she is just following her husband's lead. She is not the complete opposite of Wanda, because both love their children.
In April when bad luck happens, the Anti-Fairies were released to do the bad luck, Anti-Wanda was still trapped until Timmy and Cosmo wished them all out. Without knowing that they caused trouble, all of the Anti-Fairies were released to cause havoc. But they were eventually sent back when Timmy tricked them into going to Fairy World. They were now trapped in a maximum security prison where the worst villains of all time were kept.
The prison was wish-proof, so no one could wish them out. Timmy made a plan to break Anti-Cosmo out, but every one of them failed, and one reason was because of Anti-Wanda's stupidity. Despite this Timmy and his godparents were able to get Anti-Cosmo out and were able to do the Fagiggly Gland surgery for Cosmo. Later she broke out thanks to Professor Calamitous. She was recaptured however thanks to Jimmy's modified Hyper Cube. After that she is usually seen in Anti-Fairy World with her husband and the other Anti-Fairies.
In the television special, Anti-Poof, Anti-Wanda gets pregnant and gives birth to Foop. Later on, Foop betrays the other Anti-Fairies by turning Anti-Fairy World into a happy and colorful place. Despite this betrayal, when Foop is defeated Anti-Wanda still loves her son and shoves a bottle in his mouth when he was crying. Later on, she and Anti-Cosmo brought a cake with a metal file tool stuck in it so that he could try escape from his "maximum security time out" at Abracatraz.
Relationship with Anti-Cosmo
Anti-Wanda thinks of her husband much like Cosmo does of Wanda, an intelligent and reliable spouse. Anti-Cosmo is the opposite of Cosmo, and he is mostly like Wanda in personality and actions. They both share the same problems that Cosmo and Wanda do, but nevertheless they love and care for each other.
Relationship with Foop
From the very first day Foop was born, Anti-Wanda's relationship with her son was rather neutral. After she hugged him, he said that he was bored with her already and Anti-Wanda pointed out that he was sharp-tongued. But Foop was grateful that his mother helped him find the nearest magical power source. She wasn't angry at him when he turned her into a Care Fairy and caught him when he fell asleep after the fight with Poof. She also shoved the bottle into his mouth when he was crying. She and Anti-Cosmo tried to help Foop escape from Abracatraz by sneaking a nail-filer in a cake to his playpen cell. Later, Foop escaped from prison without any help and isn't seen with his parents anymore. However in the episode Love Triangle, Foop appreciated that she packed snake venom antidote with chicken nuggets into his lunch, which means that she might still live with him. It is assumed that her relationship with her baby is the same as any other mother and child.
Anti-Wanda is reckless and incredibly dumb, while Wanda is smart and not reckless.
Anti-Wanda gave birth to Foop, while Wanda did not give birth to Poof, instead it was Cosmo.
Anti-Wanda doesn't nag anybody, but she does end up annoying people with her eating habits. Wanda does nag people.
While Wanda eats with her hands, Anti-Wanda likes eating sandwiches with her feet.
Anti-Wanda hates chocolate while Wanda loves chocolate.
Anti-Wanda rarely gets angry (as opposed to Wanda, who's often temperamental).
Wanda makes food that looks good but tastes awful. Anti-Wanda makes food that looks awful but tastes good.
Cosmo had his baby in 3 months while Anti-Wanda had her baby the second she found out she had cravings.
She also barfed up butterflies while Cosmo barfed up grape jelly.