The main theme could be isolation. The 'hollow man' often represents a sense of emptiness and detachment from society or oneself, which is a common exploration in many novels.
Well, in 'the hollow man short story', I think one of the main themes is the loss of identity. The 'hollow man' gives the impression of not having a true sense of self. It could be due to various factors like a society that doesn't allow for individuality or some personal trauma that has stripped away his essence. So, the story might be exploring how one can lose their identity and what that means for a person's existence.
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.
The main theme is about the power of love and the struggle for self - discovery and liberation. Celie endures much abuse but through her relationships, especially with Shug, she starts to find her own voice and value.
One of the main themes is the struggle against oppression. The characters face different forms of it, like the strict and often cruel religious and patriarchal rule in their family.
Another possible theme is sacrifice. There could be situations where the characters have to give up something important for a greater good or for the sake of their relationships. This can add depth and emotional complexity to the story in 'Purple Hearts a Novel'.