This is always tough. Some of the street performers have already changed...
Swamp Musicians are gone. Replaced by Construction Tap Dancers which only show during peak periods.
Minions are near Cartooniversal gift shop since the ride is not accessible yet. Sometimes they are in Universal Plaza.
Doc Brown is a floating character as well as Beetlejuice and Frankenstein. Usually found near Cartooniversal.
Lucille Ball seems to have a permanent spot with Marilyn Monroe at the moment at the Studio Tour queue. But never solid because they can move too.
Spongebob usually in Universal Plaza, but not when Grinchmas is on.
Simpsons, yes, near the ride only.
Dora and Diego are getting scarce, but mostly in the Studio Center (Lower Lot) along with Transformers and Mummy Stilt walkers.
New York actors, as well as a policeman, have been prominent near the Construction Workers stage.
Scooby Doo and Shaggy have been frequent lately, and also roam. Woody Woodpecker and Betty Boop have been seen a lot lately.
Because of the lack of attractions, characters in the park have been stepped up to appeause the guests interactivity.
Have not seen the band on London Street for a while, although I did see the Pianist yesterday. Moulin Rouge sometimes has a few different shows they rotate between. Come to think of it, there has been a lot of streetmosphere lately.