I really want to get one too. my friend she has got one and I asked her how well did you take care of it...Well she said that in order to get one it has to be an even number generation (2, 4, 6 gen. etc) and you don't really have to take care of it 24/7!! check on it every 30 min or so and definately turn the lights off when it goes to sleep. don't feed it any snacks. (This goes with any rule if you want a good character!) Yes it has to be an onionchi or a young mimitchi.
Hope that helps....
I luv this character-