I find it hard to believe that there wouldn't be any way to add a character to the game with the possibility of marrying them - I'm almost positive it will appear.

My character just got married in the game, but there really isn't a whole lot there that they can do. The store is nice... sort of. Doesn't make much sense that I have to pay for stuff that's, technically, mine, though.
Here are some ideas I had for expanding on this;
- Ability to change your husband/wife's clothes and give them other items to equip. My significant other is carrying around a pickaxe constantly because she was a miner, and her clothes look pretty ratty for someone of such high station (I mean, we live in Solitude, and it's a pretty ritzy neighborhood. I'm also a celebrity - come on!).
- Ability to offload crap that you have into their store so they can sell it overtime. Additionally, you shouldn't have to pay for any of it if you want it back, or see a certain item he/she picked up that you want. This may require some tweaking to avoid getting super-awesome items for free. At the same time, it would make it quite a bit easier to offload goods for gold instead of running from town to town and cleaning out each merchant of their money.
- Maybe the inclusion of a store front in each city that you can purchase for them. It seems kind of weird that they would be selling this stuff out of your home. Have it open from, say, 10am-3pm, so that gives them time to head back to the house and be all
wifey and stuff.
- Just plain-old more "interaction"... nuff said, really. I think you can use your imagination.