The full text of the essay "Walking in the Rain" was as follows:
walking in the rain
I walk in the rain with light steps, feeling happy. The rain kept hitting my face, and I kept walking forward as if I was walking towards my dream.
The rain drenched my clothes, but it didn't stop me from feeling the warmth it brought. I felt the rain leaving small puddles on my face, like small lakes. I took a deep breath and felt the fresh air as if all my troubles had been washed away.
I walked forward, feeling the moisture of the rain under my feet. The trees by the roadside seemed to be even taller in the rain, and the flowers were even more beautiful in the rain. Everything became so beautiful. I stopped and looked at a flower dancing in the rain, feeling the charm of nature.
The rain kept hitting my face but I never felt cold. I enjoyed this beautiful moment, feeling the charm of nature, as if everything was no longer important. I walk forward with firm steps, my heart full of hope.
I walked in the rain, feeling the warmth and charm of nature brought to me. I know that no matter what I face, I can go forward bravely because I have a firm belief and a beautiful heart.
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.
He could have been on his way home or perhaps going to some important place. He might have been in a hurry, but the rain was slowing him down. He also might have been looking for shelter from the rain, like a nearby store or a bus stop.