Here's what I'd look for in an in-game spouse:
1) Willing to farm with me for many items I need, especially AD materials.
2) Online most, if not all, of the times that I am on.
3) Friendly, but not so talkative that I get annoyed.
4) Intelligent and Dexterous
In short, I think heRO should allow people to marry homunculuses. Kiaro, my Lif, would be the perfect wife. We have straight marriage, gay marriage...homunculus marriage please. It's way more deserving than most candidates out there.