Ok, time for a bit of analytical thinking.
I'm thinking about Mirumoto Hanabi. Ok, she's yandere, thus obssesive, and could be a real issue with any female near us. In any sense of the word.
Two, she's a capable bushi, with Dragon training, and the potential to be seriously loyal, and useful.
The problem with any yandere is, as it has always been, they get possessive and dangerous. However, there is always a reason that the yandere has chosen her target, and that can be the perfect lever to re-focus her into being something less unbalanced. Still, this will take time and effort, so we should consider whether we want to salvage her, and make a loyal follower of her, or not take the risks and effort.
Note, classicly in L5R, marriage would lead to our partner being sent to our lands, rather than traveling with us. Still, she could be assigned to our group for a number of reasons, mostly political, and a marriage could be part of that(Not likely, though).
Right, bottom line. Time and effort, some risk, buy off the flaw, buy her as an advantage, this can happen. Is it worth it?
Well, I want to do this, but that's cause I'm entertained by the whole situation. You guys'll have to make up your own minds.