Cheesy as fuck anime dialogue/writing aside... Nero has fucking swag. I wouldn't mind return of a more bad ass older Nero in DMC5. Just delete Kyrie from the franchise or have her die in the opening scene by the hand of Vergil setting the tone for the game.
If they can make Nero as awesome as Dante was in DMC4 then I wouldn't mind them both being in DMC5.
Also fully support Kyrie dying a horrible death right up front.