A noble lady born as the only daughter of Duke Claes. After hitting her head in an accident as a child, she realizes she has been reincarnated as Katarina Claes, the villainess of the dating sim "Fortune Lover" that she used to play in her past life. Every route in the game ends in the worst possible way: either death or exile... To prevent this, Katarina devotes herself to "avoiding doom flags" by putting in all sorts of unladylike efforts, including farming, swordsmanship, networking, and studying. However, her innocent and eccentric personality, combined with the relationships she builds to stop the doom flags, ends up capturing the hearts of those around her instead.

Katarina's adoptive younger brother, a boy who harbors absolute affection for her. In the past, he was called a monster because he couldn't control his immense magical power and accidentally attacked his older brothers. However, after meeting Katarina, he is no longer lonely. In the original game, he was a love interest for the heroine, but in reality, his world revolves entirely around Katarina.

The third prince of the kingdom and Katarina's fiancé. He always wears a smile, but he is surprisingly possessive for a prince.

Geordo's tsundere twin brother. He used to harbor an inferiority complex toward Geordo, but he opens his heart thanks to Katarina's innocent encouragement.

A passionate girl who used to be timid due to being bullied by her older sisters, but fell head over heels for Katarina after hearing her words.

She was called a cursed child because of her silk-like white hair and blood-red eyes. After meeting Katarina, who told her that her appearance was beautiful and gave her confidence, she came to adore her. She seems to share some memories of her past life and has a deep bond with Katarina. She was likely Katarina's best friend in her previous life. However, no one knows that fact.

Because of rumors that his younger sister Sophia is a cursed child, he is misunderstood as a pitiful boy. However, he comes to adore Katarina because she was the first to understand his happiness. Since Katarina has a fiancé, Geordo, he does not show his feelings. He is a beautiful boy of few words, but he softens slightly in front of Katarina.

The true protagonist of Fortune Lover and a pure saint. However, in this reality, she is the protagonist of another "doom route" who has fallen in love with Katarina. In the original work, Katarina would have bullied Maria Campbell, but here, Katarina unconsciously saved her.