It's about an undead adventurer. He's unwanted, which likely means he faces a lot of challenges and discrimination in a world that might not be accepting of the undead. Maybe he has to fight against the general perception of the undead while also trying to survive in a world full of danger and adventure.
The central character is the unwanted undead adventurer. He's the one whose journey we follow. Alongside him, there may be a group of diverse characters. For instance, a young and naive apprentice who looks up to the undead adventurer. There could be a sly merchant who tries to take advantage of the undead's situation. And then there are the villains, like a dark wizard who has a vendetta against the undead and wants to use his power for some evil purpose.
You can try sites like NovelUpdates. It often has information about where to find various light novels, including 'unwanted immortal adventurer light novel'.
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