HELPP I WILL UPVOTE

Read this excerpt from Journey to the Center of the Earth.

Another peculiarity of his was, that he always stepped on yard at a time, clenched his fists as if he were going to hit you, and was, when in one of his peculiar humors, far from a pleasant companion.

Who is being characterized in this passage?

Professor Hardwigg
Harry
Gretchen
Hans