I had Orenetchi once on my Party Pix, and he was no trouble at all. On the tamagotchi.com website, his description (in party pix and pix) is: Orenetchi is usually very cheerful, though can be mischievous at the same time. He doesn't like to be considered a child, so he does all he can to say and do things to seem older.
I think it would be safe if you just let it's hunger drop, feed it 1 bagel, and wait for it to poop and repeat until it has 3 care misses. It would be safe to wait for the skull, ( which means its just sick ) which should take 10 - 15 minutes.