I like the sound of a hippo creatu and more hair colour options :D

Check the Dream builder for the masks, we have similar items to what I think you're suggesting!

Hmmm while I don't like the sound of "patterns" I like the idea of having some special effect for each planet ><

Creatu can already die via starvation and apparently they're bringing back illness's which would be great to see :D

If you ate going away for awhile you can put your pets into your Showroom, here they won't age or get hungry ( Click the dog statue on the top blue navigation bar) you can upgrade your showroom to hold more pets, just like you suggested :D

You can also stock up your food pen which will automatically feed hungry pets