I think I'm quite cat-like in nature, so probably I'd be a cat. Undoubtedly I've become more hamster-like since I got my new one after my hiatus for college, so possibly a hamster too.
I think I'd probably be a tabby cat with a white face/paw tips as my usual garb is something along those lines. If I was a hamster, I'd probably be grey-ish with the signature darker stripe from the head down the back, typical of dwarf hamsters.
Personalitywise, I guess peppy. I'm pretty excitable and nothing much gets me down for long. I'm not sure at all about the initial phrase, maybe something along the lines of "nyaa" as I do tend to make that sound when I'm excited, and it would go hand in hand with the peppy nature. >w<
I don't like coffee, so I'll go mocha, lots of milk, three sugar. Cover up that taste as much as possible.
House would probably be like a log cabin with a hedge around it, or maybe the zen exterior instead, with a cosy little room inside. I don't think it would be a set in particular, maybe something like Dora where the house actually looks lived in. If it was based off my real life room, it'd definitely be sloppy furniture.
And for initial clothes... I really don't know about that. ;u;
I'd love to draw some of these designs though, they sound supercool!
Also also, imagine playing as an animal, and collecting other animal players as your villagers. >o< You could get them through WiFi, connecting with friends, Spotpass, etc. And you'd end up with a collection of people you'd met, a bit like the Happy Home Showcase.