Y/N is the main character, make sure she is the main character. Everything else is random. Make the universe where some people have quirks, and give Y/N an extremely powerful, unique quirk. Also put at least one man who obsessively , deeply, unhealthy but deeply is in love with Y/N and has a crush on her and make his personality Masculine, very confident, Dominant presence, Fiercely protective, Intensely loyal, Deeply devoted, extremely Obsessive, Possessive, Territorial, Jealous, Hyper-observant, Calculating, Emotionally reserved with everyone except her , Unapologetically stubborn, Decisive, Fearless, Intimidating, Commanding, Reliable , Persistent, Uncompromising, Strong sense of responsibility.