Jafar's nemesis is Aladdin and Iago, Sykes' nemesis is Fagin and Jenny, McLeach's nemesis is Cody and Marahute, Captain Hook's nemesis is Peter Pan, Tick Tock Crocodile, Jake, Izzy and Cubby, Maleficent's nemesis is Flora, Fauna and Merryweather, Cruella De Vil's nemesis is Pongo, Perdita, Roger Radcliffe, Anita Radcliffe, Nanny and The Puppies, Shan-Yu's nemesis is Mulan, Captain Li Shang, The Emperor of China, Mushu, Yao, Ling and Chien Po, Gaston's nemesis is Beast, Belle and Maurice, Scar's nemesis is Simba, Mufasa and Kiara and Ursula's nemesis is Ariel, King Triton, Sebastian, Flounder and Prince Eric.

I thought for a while and decided on this, I think the evil queen, the queen Grimhilde, is actually mother Gothel. Now I will tell about their similarities:

1- Eyes. They both have green eyes.

2- Black hair. They both have thick, black hair.

3- Both of them try to stay young and beautiful.

4- Both turn into old hag.

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Yes, they look very similar. But there are also changes. Mother Gothel, unlike Grimhilde, raised Rapunzel well and took good care of her.
There is a very logical Disney theory. Queen Grimhilde did not die when she fell from the stone at the end of the movie, and she rolled over and found the flower as an old hag. She was empowered by the flower, rejuvenated, and then implemented a different plan than before.

Makes sense, right? Do not forget to write in the comments what you think.