The Court of Souls?

In a world governed by raw power where the weak are insignificant and survival of the fittest reigns, a lonely child possesses a unique ability that places him between light and darkness. This power, which allows nothing to escape him, causes him to be ostracized by his people. Despite his struggles and battles against his fate, he does not become a traditional hero. Instead, the story unfolds as a narrative about a demon who is exceptionally kind, distinguishing himself from the monstrous nature of his kind. The protagonist's power is described as something everyone must coexist with, rather than a force he uses to reshape the world through heroic deeds. The novel explores themes of reincarnation, magic, multiple perspectives, souls, demons, a fantasy world with a futuristic setting, and various religions and mythical beasts.