Poe Collector

The poe salesman is located at the guard's room on Hyrule castle town, he pays for every poe you bring to him, If you join his club and bring him ten big poes he will give you a bottle. He has boxes with all kinds of poes crawling out of them on his shop. He also appears on Majora's mask where he has the poe sisters captive there, how they escaped is not clear but you find them as an adult on Ocarina of Time. Oddly enougth when you go to that spot as a child, you find a hylian soldier that tells you that he is very interested on ghosts.