Peter Parker

At the start of the movie, Peter Parker, voiced by Chris Pine, is Spider-Man in Miles’ dimension and has been that for 10 years. However, as mentioned in the previous entry, he dies at the hands of Kingpin trying to stop his inter-dimensional collider.
Peter also plays a posthumous role because Miles and his fellow Spider-people (more on them in a minute) end up at the home of his aunt, Aunt May. May’s backyard is where Peter kept his—basically—Spider-Cave, filled with all sorts of gadgets and gizmos that help the other Spider-people. (Oh, and he had an album of Christmas songs.)