Beatrix at first views Adelbert Steiner, the captain of the Knights of Pluto and a soldier in her senior, as a rival. Steiner, meanwhile, is frustrated over the superiority of Alexandrian soldiers led by Beatrix over his Pluto Knights.

Beatrix is noble, proud, and most of all, loyal to Alexandria and the Alexandrian royal family. She is confident in her ability as a soldier, and can be seen as being arrogant because of this. Beatrix has an outstanding ability as a leader, collecting loyalty and admiration from both the public and the soldiers under her. Beatrix is soft-spoken and addresses people with perfect manners, be it to her soldiers or to an enemy, although this is not as obvious in the English localization as it is in the original Japanese version.

Beatrix shows no mercy for one who poses a threat to Alexandria and acts solely as a soldier, obeying orders without hesitation or showing emotion. Despite her infamously merciless behavior, she has a kind heart and willingness to forgive. Baku says Beatrix has a big heart, unlike the "knuckle-headed" Steiner. It is implied Beatrix feels lonely in her position, which in part leads her growing closer to Steiner.