And where is he perfect? He spends half the game being useless and the other chasing after Kyrie also uselessly, can't hold a candle to Dante in terms of skill or ability, is objectively inferior in gameplay abilities and has no real background info in the game itself.
Nero is no different from Jacques in Onimusha 3, a newcomer character that gains similar abilities to the previous main character. He's not perfect and nobody in game treats him perfectly. At best he's a self-insert and even that is doubtful.
Unlike Nero, Jacques was a beast I remember being excited when he beat the s*** outta Ranmaru.
Nanomachines, Son Official Zidane Tribal of the FFXV Board
That is talking about the unofficial book that was created on the side for DMC4 that wasn't cannon to the story of DMC4. In the book Vergil came to Nero before he awoken his powers. In the actual game Nero remembered the scene where Kyrie was about to be killed by a demon and he rescued her.
Dante is 28/19 in DMC4. This is what Capcom has stated. Nero is the same age Dante was in DMC3, this is also what Capcom has stated. DMC4 is a few months after the Anime and almost a year after DMC1 since the Anime is some months after DMC1.