Final answer:
In the book Wonder, Summer wanted to be Darth Sidious from Star Wars for Halloween.
Step-by-step explanation:
In the book Wonder, Summer wanted to dress up as a character from the Star Wars franchise for Halloween. Specifically, she wanted to be Darth Sidious, who is also known as Emperor Palpatine. Summer thought it would be a fun costume because it would be unexpected and show her love for the Star Wars series.