Ginko travels around as a mushi master—basically a problem-solver for people dealing with supernatural mushi-related issues. He researches these creatures wherever he goes, trying to understand them and help those caught in their grip.
The thing that defines Ginko's whole existence is that mushi are naturally drawn to him. It's rare, and it's the reason he can never stay put. Hang around one place too long and mushi start piling up, which gets dangerous fast. He chain-smokes constantly as a workaround—keeps them at a distance.
Personality-wise, he comes across as pretty easygoing most of the time. But flip a switch when people are actually in danger, and he becomes dead serious about protecting them. What's interesting about Ginko is his whole philosophy on mushi themselves. He pushes back against the idea that they're just evil monsters. They're part of nature. They exist, they survive, they do what living things do. That's it. He doesn't hate them for it.
Content compiled by AnimeList.moe from publicly available sources.