The Rani is the key character in big finish rani stories. She is a complex character with her own motives and goals. Alongside her, there can be various victims or targets of her plots. These could be ordinary people from different planets or even other time - traveling beings. Additionally, there might be some characters who try to oppose her, like some brave individuals who realize the danger she poses to their world or the fabric of time itself.
Well, in big finish rani stories, one interesting thing is her relationship with other characters. She has a very antagonistic relationship with the Doctor at times. This creates great tension and drama, as she tries to outwit him with her own brand of evil genius.
I'm not sure specifically which one is considered the very first. But generally, Big Finish stories often involve the Eighth Doctor having various adventures, perhaps encountering strange aliens, exploring new planets, or getting caught up in time - related mysteries.
Obviously, the Eighth Doctor would be one of the main characters. There might also be some side characters who could be the locals of the place where the story is set, like an alien species or a group of humans in a far - off colony.
On Rani's first day at school, she probably had a mix of emotions. She might have been looking forward to making new friends. When she entered the school building, the big hallways and different classrooms might have seemed a bit overwhelming at first. She could have met a friendly teacher who showed her around, which made her feel more at ease.