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I didn't think Sister Aloysius was necessarily a mean or witchy character. In fact, I felt very warmly toward her because she reminded me a lot of my grade school principal, a nun who was a stern disciplinarian (who kept on using her yard stick on unruly students even into the early 1990s, which is when I graduated from the school) but who I also knew as being kind, loving, and generous toward those of us who were "good" and knew how to behave, or who were the subjects of bullying or ostracism (I was both, i.e. a "good" student who was bullied a lot, so she took me under her wing and was a surrogate parental figure at school). Anyway, I feel that Sister Aloysius is probably exactly like that beloved former principal of mine, a woman I am forever indebted to. Is there a YMMV trope that deals with this?
Alternate Character Interpretation comes closest, but I think using it here would be a stretch. Aloysius' strict measures may have good intentions, but she lacks any Pet the Dog moments to show she actually has a good heart for those who are obedient.
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How well does it match the trope?