Bleach Manga thread (SPOILERS)

consider byakuya's four-great-noble-bloodline status. that type of person doesn't (isnt allowed to) marry a commoner.
he married rukia's sister, then found rukia after the sister died of illness. sure, its a stretch, but rukia's gotta have some edge for being the eternal (losing) underdog

It's not like you have a choice in soul society. Literally everyone is a commoner. The "4 noble houses" have something like, 2 actual blood members shown (Byakyuya and Yoruichi). Everyone else is a commoner.

And since the only job is "soul reaper" it makes much more sense for them to marry some random commoner who is less likely to get themselves killed than a random foot soldier, most of which have shown to be as good at fighting hollows as a regular human, forget anything actually dangerous.