Buddy
Buddy is the narrator of this story. He serves as an advocate for his brother's honor when his brother fails to fulfill his commitments, leaving his fiancee at the altar on their wedding day. When others try to insult Seymour, Buddy defends him, and he even introduces the reader to Seymour personally in the second story.
Seymour
Seymour is a depressed person, the brother of Buddy. When he stands up Muriel on their wedding day, his character comes into question. The novel is mostly talking about Seymour, a character who never really appears in the text.
Boo Boo
Seymour's and Buddy's sister who lives with Seymour at their family apartment where she likes to leave him messages, like the title of the first story, a line from the Greek poet Sappho.
The Matron of Honor
The Matron of Honor from the wedding party ends up in a car with Buddy, but she doesn't know who he is in relation to the groom, so she openly badmouths Buddy's brother, making outrageous assumptions about his character.
The Matron's husband.
This person serves as a foil to Buddy. The same way Buddy stands up for his brother, the Matron's husband stands up for her point of view, leaving them both ashamed and embarrassed when Buddy reveals that he is Seymour's brother.
