It's not just the effect of different mediums. They somehow messed up the plot, change the time of persional revelations thus rendered some of Nina's actions quite unexplained. On the top ofit they added some unwanted extra. It's not just the effect of cutting out scenes and internal monolouges.Even without that she would show a face closer to the LN's.
True maybe if we analyse througly her actions she may remain the same, but most of the viewers don't have time or mood for that.
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