Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

rupert thorne is a fictional batman character, who is the crime boss of batman.
rupert thorne

sir john soane (10 september 1753 – 20 january 1837) was an english architect.
john soane

panoplosaurus was an armored tank-like dinosaur from the upper cretaceous, living about 76–73 million years ago.

panoplosaurus