I mean, Lydia's direct celestial upgrade is some kind of Abyssal lookalike. Of course she's not exactly good.Which is kind of funny because Lydia isn't what I would call good. I mean yeah she has sympathy for the dead and she values her friends, but push comes to shove she still got her morals from one of the Old Gods, directly and by reading material plus the kind of tutors he hired. If someone gets into a legitimate deadly feud with her Lydia would treat it like it's 60 AD and she is queen of the Iceni.