In the first sentence of the passage, the description of Ignatius’ head as a “fleshy balloon” contributes to the narrator’s portrayal of Ignatius’

It helps to show that Ignatius had an unpleasant physical appearance.

Explanation:

Ignatius is a peculiar character. He is not described as a great heartthrob, an admirable man or even as a handsome man, but he has an unpleasant physical appearance and a doubtful taste in fashion, in addition to behaving in an unconventional way. His physical appearance resumes when the narrator describes his head as a "fleshy balloon". However, all this strange appearance is very important in the development of the character and the story.

yup its an addiction

i may be wrong but i think your answer is flashback