Nippon Ichi Software might have more PSP games in development other than Princess Antiphona. A flyer surfaced for an unnamed game and mysterious hero that can be modded with Prinny parts.
No details have been given aside from teaser text that reads “hero modding project go!!” and a picture showing the hero with added tank, animal, drill, and Prinny parts. Since a PSP logo is in the top right hand corner this title, whatever it is, must be a PSP game.
The character art reminds me of an obscure Nippon Ichi game called Jigsaw World. Doesn’t this hero look like Mute Kid?