"Mari Souma is one of the main characters in the Japanese manga series ""My Harem Grew So Large, I Was Forced to Ascend"". Mari is a beautiful and intelligent high school student who is also the class president. She has a charming personality and is well-liked by her peers.

Mari plays a significant role in the story as she is one of the girls who joins the protagonist's harem. She first meets the protagonist, Rito, when he helps her carry her books on her way to school. From that moment on, Mari becomes smitten with Rito and shows a keen interest in him.

As the story progresses, Mari's desire for Rito grows stronger, and she becomes more aggressive in her pursuit of him. Despite her strong feelings for Rito, Mari remains loyal to her duties as the class president and continues to work hard to maintain order within the student body.

Throughout the manga, Mari is portrayed as a strong and confident young woman who is not afraid to speak her mind. She has a sharp wit and is able to keep up with Rito's quirky sense of humor. Mari is also a skilled martial artist who is capable of holding her own in a fight.

Overall, Mari's character is an essential component of the harem dynamic in the manga. She helps to bring a balance of intelligence, strength, and humor to the group and is an important catalyst for Rito's growth as a character. As the story continues, it will be interesting to see how Mari's character develops and how her relationship with Rito evolves."