My arrangement seems to be one of the least popular - I live with one roommate! Thanks to college I've had a preposterous amount of different roommates over the last five years (only one semester without a room all to myself though - never again!), but this is the first one I'd say I'm actually friends with. It's been more fun than I expected! Dear boyfriend might move in with me next year, which I'm pretty sure I would love.
I'm pretty reclusive, so I would also enjoy living alone, but it's not financially feasible right now. On that same note, I can't afford the extra rent to have a kitty yet, but it's like, my goal in life to have at least one. Probably two. I'd also like to have a snake.
My dream living situation would be with dear, my feline children, and perhaps my snake in a place that's spacious enough that we'd both have our own rooms in addition to our shared bedroom and communal spaces.
I think the poll lacked one important option though: My toys live with me, and they're totally part of my family, especially my stuffed animals. They're always there for me.