You have to find the common theme suggested from these pictures!
I think they are all
First names of US Presidents
Reading left to right First row
John F Kennedy - John is slang for toilet in the US
Thomas Jefferson - Thomas the tank engine
Barack Obama - sounds like Brock from Pokemon
George Washington - George Weasley
Grover Cleveland - Grover from Sesame Street.
Harry S Truman - Harry Potter
Donald Trump - Donald Duck
Warren Harding - a rabbit warren
Theodore Roosevelt - Theodore from the chipmunks.