Badass MC is only badass when enemies are around then turns around and becomes a meek damsel in distresss around the ML. ML we first see extorting his sister and the generally being a entitled asshole.
Damn, I don't like this stupid prince and I feel like he's gonna be the one she falls in love with which I hate.
Also, they're 1st cousins once-removed. Niece is just shorthand, I call my 1st cousins once-removed my niblings since the other thing takes too long to say.