For some reason...I picture Hibari's wife as a dangerous type when needed. Like she doesn't seek fights...but can still strong in a fight. Like a cute cuddly carnivore with razor sharp teeth when needed. Like social/cheerful?...Basically the wife/mother who kicks ass...Maybe a yamato nadeshiko type? Who is like a Lady of War or Cute Bruiser? (check TvTropes) Imagine this: Hibari arrives home to find a pile of intruders. With his wife humming as she cooking dinner and welcomes him home.
Oooh, I really really like this and have nothing much to add to this since it’s pretty awesomely fleshed out. He’d beat up the intruders extra hard when they wake up, probably put them in a coma state. I think he’d be just really proud because his woman could totally kick ass and is awesome and the mother of his children. Look at her go.