Hi Irasema!
I, like you, am a big fan of the Disney Villains! While I love Disney Princesses and the Fab Five (Mickey, Minnie, Donald, Pluto and Goofy), there's nothing like an awesome Disney Villain.
At this time, the only Disney Villain making regularly scheduled appearances is Gaston, beside Gaston's Tavern in Walt Disney World Resort's Magic Kingdom Park. Not to worry, there are plenty of places to get your "villain fix" when visiting Walt Disney World.
Magic Kingdom Park: Make sure to catch the Disney Festival of Fantasy Parade in the afternoon. Villains such as Captain Hook and Maleficent (in fire-breathing dragon form) make their way along the parade route each day. If you're near Cinderella Castle in Fantasyland, you'll sometimes see Lady Tremaine and the stepsisters wandering about to speak with Guests. Your favorite octopus Ursula makes an appearance in the Under the Sea - Journey of the Little Mermaid attraction.
Epcot: Marshmallow the snow monster can be found in the Frozen Ever After ride in the Norway pavilion in World Showcase!
Disney's Animal Kingdom: "Be Prepared" to hear Scar's booming voice in the Broadway-style performance at Festival of the Lion King. Across the park, "just keep swimming" if you see Bruce the shark in the live stage show, Finding Nemo: The Musical.
Disney's Hollywood Studios: Villains from the Star Wars films can be found at Star Wars Launch Bay, and there's always a Stormtrooper or two on the loose. If it's Ursula you want to see, don't be a "poor unfortunate soul" and miss
Voyage of the Little Mermaid. Ursula is also featured in film clips in Hollywood Studios' nighttime spectacular, Fantasmic!
Thanks for stopping by with your question - I hope you have a most magical Walt Disney World Resort vacation! - Diane W.