Kinoshita Nakui
Well, he's finally going to get involved with the regular people in this world now. Odds are though he'll just traipse on over, cure the plague using methods resembling modern medicine (which a real medical professional would have grave doubts over), shock them with his wisdom and finally declare he's happy living quietly and swan off back to his little house with them turning him into a legend after he leaves~ The only issue is if he decides to share his "jello" or the like with someone there. We can guess that he's much more special than he realises since it just tastes like a treat to him, but won't a mortal human be turning into an ice statue? Or will they feel such cold from getting close to it that they won't dare touch? There might be an incident or two like that~