Hi Karen,
Thank you so much for visiting the Disney Parks Moms Panel with your question!
Meeting characters is a wonderful part of a Walt Disney World vacation. You will find characters at all four Walt Disney World theme parks:
Magic Kingdom,
Epcot,
Disney's Hollywood Studios, and
Disney's Animal Kingdom. The links I provided will give a list of characters and entertainment in each theme park.
As you can see, the Disney Junior characters are mainly at Disney's Hollywood Studios. There is also the wonderful
Disney Junior - Live on Stage! show at Disney's Hollywood Studios. This show allows children to dance and sing along as some wonderful Disney Junior characters perform a great show. When my daughter was little, she loved this show! Also, be sure to check out
Hollywood & Vine restaurant at Disney's Hollywood Studios. For certain meals, this restaurant offers Disney Junior Play 'n Dine, for an opportunity to sing and dance with Disney Junior characters while enjoying a delicious meal. This was another of my daughter's favorites when she was a preschooler.
Currently, Princess Elena is greeting guests at
Princess Fairytale Hall in Magic Kingdom.
Please do let us know if you have any further questions, Karen!