Yea, that's the idea. After you beat the game, you can take your stronger characters into higher difficulties (Normal, Nightmare, Hell, and Inferno). The later ones have random bullshit monsters that will worf your characters for no god damned reason. Thus if you make a character named Signum, it'll be perfect!
Maybe you're talking about my post on the upcoming "Nanoha Innocent" manga where i compared Signum with "just modestly strong" famous Yu-Gi-Oh! monsters used by protagonists as opening moves like Celtic Guardian, Elemental Hero Avian, Speed Warrior or Gagaga Magician xD