Starfish, developer of Heavenly Guardian aka Kiki KaiKai 2, has a dungeon crawler series called Elminage. Instead of adding shiny graphics, with each iteration they added more customization options. The third game, Elminage III: The Disciple of Darkness and the Solar Palace, just came out in Japan and it allows players to add whatever images they want for character portraits.
And one gamer decided to make a party with Street Fighter characters Guy, Chun-Li, Cammy, and Ibuki.
Other players borrowed art from Etrian Odyssey, one of Atlus’ dungeon crawlers, Acquire’s Class of Heroes series, Xenosaga, and even Chrono Trigger. (More pictures here!)
And this is what Elminage III looks like outside of status screens. The PSP game is available in Japan now.