Thanks for the replies. No problem, Chao Professor. I'm glad I was able to contribute at least a little. I was also pretty shocked when I found this. I'm looking forward to what your findings are, and anyone elses!

I found that just by entering the health center, checking the medical chart, exiting, and entering again somehow changes the chao's personality. I couldn't find anything about this on YouTube, Chao Island or elsewhere so I decided to share. I uploaded a video of this so you guys can see for yourselv...