It’s not really about who Gustav Elijah Åhr—the emo rapper known as Lil Peep, who grew up on Long Island and came up on SoundCloud, the more DIY Spotify alternative, singing in his nasally, Good Charlotte register, “Bother me, tell me awful things”—was. It’s more about what Lil Peep was.He was Gen Z’s own Kurt Cobain: gleefully mischievous and deeply, obviously, troubled, sporting red nail polish and pink hair. Peep—it was a childhood nickname, …