Disgaea 4 replaces the old Disgaea sprites with high resolution ones. In case you don’t remember, here’s what Disgaea 3: Absence of Justice looks like.
And this is Disgaea 4.
For the sake of nostalgia, players can toggle between classic and high definition visuals. Nippon Ichi shared these side-by-side sprite comparisons to illustrate the change. Prinnies look so smooth in Disgaea 4.
Remember the Magichange system where monsters could turn into weapons? Disgaea 4 has that and a monster-change system where monsters can transform into giant monsters.