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 really depends. Some short story dispensers might not generate much income, while others in popular locations or with high demand could potentially earn a decent amount.
The difference between liquid soap and liquid laundry was their active ingredients and starting materials. The active substance of the soap was mainly soap base, and its starting material came from regenerative plants. The active substance of the laundry liquid was mainly coconut acid dialcoholamid (a surface active agent), and its starting material was crude oil. In addition, the soap liquid contained a soap-based active ingredient, which was similar to grease in structure. It was more effective in removing grease stains, and it was easy to separate from the fabric, improving its bleachability. On the other hand, the laundry liquids mostly used non-ion-type surface active agents, which were close to neutral, mild to the skin, and degraded faster after being discharged into the natural world. In addition, the formula structure and implementation standards of soap and laundry liquid were also different. In general, soap was superior to laundry liquids in terms of gentleness, grease removal ability, and bleachability.
There were many popular soap brands in Korea. Some of them included the soaps from the Infinity Flower series, especially the Dr. Teen brand, which was very effective for teenagers with acne. In addition, the soap from Korea's Hong Kelin was also very popular. Although it was slightly stronger in cleaning power, it was not as good as the endless flower. Other than that, there were also soaps from brands such as Ambodi, Mi Era, and Hera that were highly respected. However, the exact type of soap that suits your needs depends on your skin type and preferences.