Mama Cosma

Mama Cosma is wife of Papa Cosmo and Cosmo's overprotective mother who does not approve of Wanda marrying Cosmo. She has tried numerous schemes to break them up but has always been thwarted by Timmy Turner and Wanda. Apparently, she has nothing against Wanda, but dislikes anyone who tries to take Cosmo away from her. Mama Cosma is also Baby Poof's grandmother.

Notable scheme
One scheme that she has pulled off unsuccessfully is when she showed 500 fairies a tape about Cosmo's life. But she was thwarted, yet again, by Wanda and Timmy. Ironically, she was so moved at how much joy Cosmo brought to Timmy (at Wanda's expense) that she was among the 499 voters to vote for Cosmo to stay with Timmy and Wanda.

Trivia
In one episode, she and Big Daddy (Wanda's father) agreed they did not like who their children were married to, but they liked each other.

In another episode, Mama Cosma had the 9 hour flu. She was so ill that she forgot that she hated Wanda and she treated Wanda nicely and treated Cosmo badly.

It seems that Wanda and Mama Cosma have had a truce since Poof was born, as Wanda always calls her whenever Poof needs a babysitter.