I'm not sure who the author of '25 days with mr arrogant fanfiction' is. There are so many fanfiction works out there, and without more specific information, it's difficult to determine the author.
Since it's a fanfiction about 'mr arrogant' in the span of 25 days, it may tell a story of how someone gets to know this arrogant character better over time. It could include different scenarios like them working together, having arguments, or even slowly falling in love. It might also show how the character's arrogance affects the people around him and how he might change or not change during those 25 days.
I'm not sure specifically as I haven't read it. But it might be about a period of 100 days spent with a person who is arrogant, perhaps detailing the interactions, conflicts and possible character growth.
It might be a romantic story. Usually, when there is a title like this, it could be about a relationship between a female and a so - called 'arrogant' male. Maybe the female gradually discovers the good side of the male during their interactions.
We don't know for sure who the main characters are in the 'Love You Mr. Arrogant' novel without reading it. However, it's likely that the main male character is the one with the 'arrogant' trait. He could be a business tycoon or a famous figure. The female main character could be someone with a kind heart and a strong will. She might be a journalist or an artist who crosses paths with him. There could also be other important characters like his business rivals who might try to use his relationship with the female as a weapon against him, or her best friend who gives her advice on how to deal with this 'arrogant' man.