Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Which popular animated characters, first seen in 1996 include many different characters including ones called Ash Ketchum, Tracy Sketchit and Gar Oak?
tracy

What's the name of Doctor Who's home planet ?
doctor who

Which band was fronted by Amy Lee in the 2000s?

amy lee