1) How she treats Noire 2) How she treats her husband trying to protect Noire 3) How coldly she treats Morgan as her mother.
I would think that a woman who would be willing to utterly change her personality at MU's whim wouldn't take offense at a simple request to not afflict their daughter with symptoms of disease.
I can't tell if there is a disconnect or what, but as a mother/wife she is... Yeah.
To be fair, Tharja's curses aren't EXACTLY the same as Henry's. Henry's curses only come in one flavor "Death." They all are designed to kill. Tharja, on the other hand, can cast curses that make you happy (assuming she knows how to cast the curse Ricken did), random transformations (threatens to turn Vaike into a frog), communicating with the dead (Gregor's support), and curing diseases (Donnel's supports). So yeah, cursing Noire isn't "quite" as bad as it sounds, when you know what counts as a "curse".
As for Morgan's non-Avatar parent supports, they're all more or less the same, with only minor differences, so I can't comment on that.
Scaring Noire's father to the point where he thinks she'll kill him? Yeah, I can't justify that particular one. Tharja's just nuts.
That disconnect between her apparently good nature but still willing to curse her daughter, mistreat her husband, and have an unhealthy obsession with the Avatar is what aggravates me the most. I can't like her because of the later and I can't dislike her because of the former. Granted, some of her actions like ignoring Noire except to use as a guinea pig can be attributed to her future self, but she's still willing to use her as a test subject now.
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