Canon Shikeiki means well, even if types like her I tend to ignore in real life. Yes, I know, gag manga ruining her depictions, but still. It's gotten to the point where I've run into a few people who honestly think she's a douche who sends people to Hell for arbitrary reasons.
PMiSS outright states that she uses her spare time, which could be used to rest up and relax (lord knows she needs to blow off some steam, being a Yama sounds incredibly stressful to begin with), to go out into the world of the living and practically beg them to change their ways so that she won't have to send them to Hell when they die. She goes to the extreme (for her) of
exaggerating their bad deeds to get them to change-- given how moralistic she is, she must really really REALLY not want to send them to Hell. And Marisa's scenario in PoFV has her saying "Hell exists not to punish sinners, but to ensure that nobody sins in the first place. I am here so that everybody realizes that."
That said, I imagine that if Shiki ever learned to lighten up, she might offhandedly "sentence" someone living to preemptive Hell just to scare them into doing the right thing.
As for things like height/bust size jealousy/etc, I don't see how they would apply to her, really. She's waaaaaaaaaaaay too focused on saving people from themselves to give much thought to it. Caring about physical appearance seems like something she would not only ignore, but actively disdain, since it takes time away from the more important things she deals with every day, and for being an impermanent, trivial matter.
