Ok. The Seven Sins waifus have some drawbacks that have an interesting fetish role, can be sexual or social, but they are pretty straight foward which does not translates easy to virtuosity. Here are some drawbacks that could suit the Angels, the first is sex related and the second is social related:

>Chastity
i)Low libido.
ii)You cannot lie to her and dislikes when you lie to people and if you lie too much she´ll curse you with not being able to tell any lies in a period of time.

>Temperance
i)Orgasm denial so you can gain self control.
ii)She'll program and have a schedule for all the everyday tasks, including sex.

>Charity
i)She may "sacrifice" herself fucking random fat losers, grandpas, etc, that she considers "kind hearted" but with bad luck. Cant get a STD.
ii)She will make you give away material stuff to someone close to you that is in a greater need.

>Diligence
i)I dunno
ii)She will constantly remind you of the wrong things you've done and even make you cry, but if you follow her advise you can redeem yourself from your past, otherwise you will end up losing your mind.

>Patience
i)She´ll agree to satisfy all your fantasies but after waiting long periods of time, that she will stablish them and you cannot negotiate.
ii)She will force you to participate in an activity that requieres hard work and discipline, like art or science, and if you are already good in these tasks she will make you learn everything again from zero.

>Kindness
i)Does not like rough and hard sex, she prefers a loving and passionate fuck. However, on really rare ocassions she may agree to a hard fucking, cuz she's nice and kind.
ii)Does not appeal antisocial behaivor and forces you to attend with her to family or friends boring reunions, and since she's too nice with everyone, every male she encounters in these parties will think that she's flilrting with them and will try to hit on her.

> Humility
i)She would agree to satisfy all your sex fantasies but only after you learn how to completely satisfy her, expect lots of hours licking her pussy before a BJ.
ii)Both of you would live in a small house with pretty much nothing on it and she would get rid of any unecessary material stuff you bring in.

Those were my ideas they may be crap, but either way creating angels with super perfect personalities it ain't that cool. So creating flaws from virtues is also interesting.

Also since these are posted in /d you could add a family oriented trait like how many children she can have at once or some other preggo related stuff.