Before delving into Disgaea 4 the Disgaea team made a PSP dungeon crawler called Z.H.P.: Unlosing Ranger vs. Darkdeath Evilman. Aside from wearable Prinny parts, Z.H.P. takes place in its own underdog universe.
While we haven’t seen any Unlosing Ranger cameos (yet?), the Disgaea team took the base building feature from the PSP game and brought it into Disgaea 4.
You can move and arrange shops, perhaps in a nice little shopping district, plus decorate your base. Disgaea 4 lets players place objects and characters everywhere to create the school, cemetery or Prinny amusement park of your dreams.
For reference, here’s what a basic base looks like.