Peter B. Parker is a seasoned and slightly disheartened version of Spider-Man from another dimension in the animated film 'Spider-Man: Into the Spider-Verse.' Unlike his younger counterpart, Peter Parker, Peter B. has faced significant life challenges and personal failures, which have left him somewhat jaded. Despite this, he is wise, witty, and deeply experienced in the ways of a superhero. Throughout the film, he becomes an essential mentor figure to the protagonist, Miles Morales, helping him understand and harness his powers while rediscovering his own sense of purpose and heroism.