Elephant Matriarch is the (former) main antagonist of Disney's 1941 cartoon Dumbo. She's Dumbo's former arch-nemesis.
She is evil, heartless female elephant who hates kids. She's first seen in Casey Junior, when Mr. Stork arrived and asked which of female elephants wanted a baby. She, along with other elephants told that they don't want to have kids, because they are annoying. But when Mrs. Jumbo told that she wanted a kid, all elephants celebrated that she finally got a kid, which actually was because they couldn't take it anymore to hear her crying every day why she hasn't got a baby. When they saw that the baby is actually cute, they started to talk about that. When Elephant Matriarch tickled Dumbo, when he sneezed, his big ears were revealed. All elephants scared about his ears at first, but later started to make fun of his ears. One of elephants nicknamed him Dumbo (because she thinks that his ears are dumb). When Mrs. Jumbo was arrested for hurting Smitty (boy who humiliated Dumbo), Elephant Matriarch along with other elephants talked about them that Dumbo is just a trouble, and that he doesn't deserve to live. Elephants all decided to don't give him to eat. Matriarch made an evil plan to kill Dumbo out of his starvation, by preventing him from eating hay. Fortunately, Timothy Q. Mouse arrived, and scared elephants off. At the end of cartoon, when elephants saw Dumbo flying, they fell in love with him (even through he's just a baby, and they are all adults).
She humiliated Dumbo because of his ears along with other elephants.
She had an evil plan to kill Dumbo of his starvation, and taught other elephants how to make circle and prevent Dumbo from eating hay.
She's very similar to Daffy Duck from Looney Tunes franchise:
1. They both have their hated rivals whom they want to die out of starvation (Matriarch has Dumbo and Daffy has Speedy).
2. They both have evil minions who are helping them in their evil plans (Matriarch has Elephants and Daffy has Camel).
3. They both have mice as enemies (Matriarch has Timothy and Daffy has Speedy).