Miles Morales is the protagonist of 'Spider-Man: Into the Spider-Verse.' He is a teenager from Brooklyn who gains spider-like abilities after being bitten by a radioactive spider. Initially struggling to embrace his new identity as Spider-Man, Miles learns to harness his powers under the mentorship of other Spider-People from parallel dimensions. As the story progresses, he discovers his own unique strengths and ultimately steps up to save his universe. His journey reflects themes of self-discovery, responsibility, and the importance of teamwork.