Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
It shows racist elements through its description of the Africans. They are often described as 'savages' or 'beasts'. For example, their appearance and behavior are depicted in a way that makes them seem less than human. This is a common racist trope.
The possible consequences for the racist woman in this kind of story can be quite serious. Firstly, she may face legal action if the victim decides to press charges. In many places, discrimination is illegal. Secondly, she will likely be publicly shamed as these incidents often get shared on social media. Also, the airline might ban her from future flights with them. This is to send a clear message that such behavior is unacceptable.
It's a complex issue. Some people might interpret certain elements of Pulp Fiction as having racist undertones, while others might not see it that way.