Can I suggest adding some of the following?
- More ethnicities. Amy is great, but it would be good to have a black girl or two included. Derek was well executed, so we know you can do it.
- A girl or two with a heavier body shape. Not massively obese, but well padded.
- One or two mature women, e.g. in their thirties or forties. This would add masses of new story possibilities, such as mothers and aunts.
- One or two mature men. Same reason. Someone's father arriving home, or roaming around the house, could make for some good stories.
- An actual cat
- More household objects.
- How about adding another house next door? Not a vast expansion, just a little more room to script stories in. The current house gets a little claustrophobic and repetitive.