OHOHO! Imagine fighting Wheel Master (BbS), then (Dragon) Maleficent, then freaking Master Xehanort... AAARGH! A boss database. Congrats, WaveK89. That's the most epic idea I've ever heard.
Yep, they would be nice. And the fights could be set to the same Advent Children version of "J-E-N-O-V-A".