I suspect that will be Seiichirou's job. If I'm remembering cannon right (it's been a while), he's one of the serious types. I just don't remember how much he tends to mingle with others.

Though is it somehow wrong two have two basically reincarnated heroes rooming with a shinigami? I think the Lancers are lucky his division does more with investigation than sending on back to the afterlife! LOL!