She is blinded from love but too timid to say anything + is built as a stick, is a tsun without dere and have twintails.
I'm so happy she murdered every possible chance she had, feels like revenge on tsundere like her getting a MC from being pieces of shit (Hidan no Aria as example).
Read a bit of the novel and the MC turned fully jaded towards her, doesn't even see her as human anymore, only speaks to her when she is abusing power to make her do the right or convenient thing.
The openinf stream she does appears fairly often, she recounts events but changes everything in her favour, she changes the MC gender in her talk as she is a idol, but changes even the event, and that is to make us readers understand how she sees the world.