Gregor has become a horrible vermin more specifically a giant bug or insect.
The story Chasing Two Rabbits is an example of Zen parable.
The word <em>wishing </em>is used as a participle in this case. Although gerunds and participles look the same, they are used in different senses - gerunds generally denote nouns, whereas participles have more of an adverbial meaning.
Personification is going to be your answer. Don't read the rest because I am only doing this to reach the max character needed.