Maybe it's more of a pov thing? Like she has the traits to be FL before this.. Because this timeline is after the happy ending of the book..
Diana was
-a damsel in distress
-high morale (but actually jz being kind in order to be loved not out of genuine kindness)
-pretty
-was bless with Saintess power
But then she got over her head with her blessings.. Like 2 most wanted bachelor wanting her n all.. People who looked up to her for her Saintess power.. N someone said because she got soo arrogant, maybe that is why God took away her power.. Because she started to realllly behave for her own n only her own benefit.. And she forgot, ignore and trampled on other people.. Like she never use her power for the people anymore n only the emperor..
Like the twist.. It shows that someone who were nice could turn evil if they get too arrogant..
How did diana even become the female lead @.@ what kind of sorcery made the 2 leads fall in love with her @.@ she is crazy, a hypocrite and delulu omg