Rebellious Princess: Wishes to free her people from her family's brutal, oppressive regime, and doesn't hide this fact from her mother and father.
The Chains of Commanding: Thanks to Nills, they're inescapable by the end of the story if she doesn't want her kingdom falling into chaos as he killed all the other leaders.
Trapped in Another World: She gets taken into another world that is inhabited by dragons. It turns out that not only is this her home world, but she's also the princess in this world.
White Sheep: She's this to the dragon world's royal family. While her parents and older brother are cruel, oppressive dictators that imprison or kill their own people for slightest offenses, Anaëlle intends to do away with her family's ways once she gains her father's powers.
Did Not Get the Girl: In a very harsh subversion of the usual "save the day, get the girl" cliché, Nills has to return to the human world alone, while Anaëlle remains behind in the dragon world to rebuild her kingdom without her family's powers.
Nice Job Breaking It, Hero!: In his blind, obsessive rage, he kills Anaëlle's father before he could bestow her with powers that would allow her to more effectively rule the kingdom. Anaëlle calls him out on this.
Orphean Rescue: He follows his girlfriend and her kidnappers through the portal without hesitation.
Unstoppable Rage: Highly Deconstructed, and how! Not only does Nills' wrath make him less and less the Humble Hero he started out as, but by the end, it backfires when killing Anaëlle's family leads to her calling him out on his anger. On top of that, he inadvertently ruins any chance of either staying with her in the dragon world or bringing Anaëlle back to the human world.
Even Evil Has Loved Ones: Despite Anaëlle rebelling against her family and making it clear she has no intent of resuming her family's oppressive method of ruling the kingdom, the Queen still loves her and shows no hints of overly abusive behavior. She also doesn't take well the death of her son by Nills' hands.