Of course. For example, the fantasy sword and magic novel "Nation and God and Man" was about protagonists from different countries with different abilities. They gathered together for their dreams and goals, experienced many trials and tribulations, and finally changed the world. In addition,"Unlimited Supporting Actor" was a sci-fi novel that traveled through time and space. It also told the story of countless supporting actors in movies and television dramas. The protagonist had to support them and fight for the so-called "destined villain". Therefore, novels with multiple main characters were not uncommon. I hope my answer will enlighten you. Muah ~