It would be cool, but after a while it might get boring.
If you lost it and you were looking for it you wouldn't know what color it was so it would be harder to find, but it would be really cool.
I think it would be cooler for the screen on the tamagotchi to change colors depending on the...
I don't think it really matters which tamagotchi characters are used, as long as it is colorful and the characters are happy. It would give a better idea of what the tamagotchi's look like. Some of the entamas have one, but I think it would be cool if there were a bunch of characters on it...