Most likely not. 'Murder in the Thirst' stories are often made up to engage and thrill the audience. They might draw inspiration from real events but are not strictly true.
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.
Here are some authors and recommendations similar to Thirst Quencher: 1. Book of Troubled Times, Author: Ji Cha 2. [Spirit Realm Traveler], Author: Xiao Langjun 3. The Tang's Table, by Jie and 4. King of Familiar, Author: Light Spring Flow 5. Fairy, Please Listen to My Explanation. The authors and works of these novels were similar to Thirst Quencher, so they could be recommended as reading choices.
I don't know who the author of 'the great thirst novel' is. There are so many novels out there and without more information, it's difficult to determine the author.