this message may be
offensive
No, it's not. However, I can suggest one thing: you should watch a Bollywood movie called "Ek Villain" with English subtitles. In the movie, the protagonist is a hitman, while the female lead is an optimistic woman with a terminal illness.
Based on that, you could write an Adrienette story where Adrien is the hitman who has been struggling with the loss of his parents. He was raised by the Italian mafia, and during this time, he meets a beautiful young woman with blue hair who remains optimistic despite her illness. She has a bucket list and writes her wishes in a diary. Whenever one of her wishes is fulfilled, she pastes a photo in her diary to indicate that it has come true.
Adrien falls for her and decides to help her fulfill her wishes. Eventually, Marinette and Adrien get married, and Adrien resolves to quit his life as a hitman to pursue a normal life, as he has finally found a home with her.
However, on the first day of his new job, Marinette discovers that she is pregnant. At that moment, a mysterious villain with a creepy yellow smiley face mask appears and ultimately kills Marinette. It's up to you to decide which character from the Miraculous universe will be involved. This mysterious villain is unemployed and unsuccessful. Because of this, his wife always ridicules him, which deeply hurts his male ego. He cannot kill his wife because he loves her, but whenever any woman talks back to him, he decides to kill them since they remind him of his wife, whom he can't harm. Marinette is one of those women who dares to speak back to him.