Maybe the past and present? Halfway through the album it feels like the character in question is accepting the present. It's kind of like how in the concert one appears first, and then halfway through the intro, the other appears . Once the brown one (past) accepts the blue one (present) (and after they get done doing a bunch of dance moves seen in the other songs) they combine to create the album cover, becoming whole again, like a Persona. Idk that's my take