Hello Lindsay,
I absolutely love meeting the characters in World Showcase. Seeing them in their "natural" surroundings is always fun. I would strongly recommend checking the times guide or using the official
My Disney Experience mobile app. This app will give you the most up to date information regarding times and locations of these character meet and greets. This app is also great to use in all the parks to get the most up to the minute wait times for the most popular attractions and shows.
There is a strong possibility that there will be a queue for them, but in my experience, I have never waited super long for these characters compared to the Character Spot in Epcot or some of the character meet and greets in Magic Kingdom.
So, have fun spotting Mulan in China, Mary Poppins in United Kingdom, Belle in France, Aladdin in Morocco, Pinocchio in Germany, or even Donald in his Three Caballeros attire in Mexico. Keep in mind that characters could vary by day, so check the schedule on the day of your visit to Epcot.
Have a magical trip!
~Allison L