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.
A combo of a marketing - savvy person and a skilled game designer can also be excellent. The game designer focuses on creating engaging gameplay mechanics and levels. Meanwhile, the marketing - savvy individual can promote the game effectively, getting it in front of a large audience. This way, more people will be interested in playing the game.
One of the great combos could be a strong designer and a talented programmer. The designer can come up with innovative and engaging concepts, while the programmer can bring those ideas to life with efficient code. For example, a designer who specializes in creating unique gameplay mechanics paired with a programmer who is excellent at optimizing for different platforms can lead to a very successful game in Game Dev Story.