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I don't know how Lorelei doesn't end up with peaceful roles – in my case, there's a chance he could be a peaceful character. Although it's a slightly smaller chance than for other suspects who might be negative. In general, I consider the following to be peaceful (in order of decreasing probability): myself, Nebka, Heroist, Yashur, Mental. The rest are unclear for now.
Where was the evidence against Koshu? I'm too lazy to look for it. It's better to pin it on him than to rely on probability/deduction.