Old Man

The Old Man (おじいちゃん, Ojiichan) is a solitary elderly man who lives at Windmill Hermitage. He has a disdain for "westernism", which is only heightened by his neighbors at the American House. He tends to use western phrases in his speech, likely influenced by his neighbors despite his supposed hatred of their values and expressions.

Hint
There is something you can find in his house after your first encounter with him (that windmill is quite loud isn't it?) that clues you into what the old man is passionate about.