Speaker
The poem's speaker is a disturbed individual (implied through a number of contextual hints to be male, though this is unstated) who decides to commit a murder as a way of proving himself or making a mark on the world. The speaker feels alienated from his surroundings. He suggests that school was difficult for him and is now unemployed. He seems to live alone and be isolated. At the same time, he has delusions of grandeur, believing himself to be a "genius" and a "superstar." This causes him to feel ignored and slighted by society. He takes out his anger by seeking attention from others and by tormenting or killing animals, but when none of these bring fulfillment, he instead chooses to kill a person.
The Radio Host
Near the end of the narrative, the speaker calls into a local radio show and tries to convince the host that he is talking to a superstar. The implication is not that the speaker is trying to pass himself off as a celebrity, but rather that he believes he is already special, and destined to become famous (or infamous) through his violent act. The host is not impressed, however, and cuts him off in the final moment of rejection and frustration the speaker faces before committing murder.
You
The final line uses a second-person address and pulls the reader directly into the narrative by implying that “you” will become the speaker’s first victim. In this way, while the poem has made clear throughout that the speaker is likely to kill or harm someone, the final line abruptly shifts the focus from the killer to his victim. Unnervingly, the speaker is willing to address the victim directly in the second person, appearing not to feel at all ashamed or avoidant despite the fact that he plans to kill them. Indeed, the speaker's encounter with his soon-to-be victim is the first real moment of connection to another person he appears to experience.
