Pointy-kun is an image found on Sadako Yamamura's cursed tape. The image is of a man with a white towel over his head standing in front of a body of water. He's pointing off screen. In Ringu, Pointy-kun just about jumped off the screen and acted as a symbol to Reiko, pointing out clues and dangers to her (such as when she saw Ryuji in full Pointy-kun regalia reflected in her television, pointing at the bag that contained the cursed tape). I'm sure there will be moments where Pointy-kun will make an appearance in this fic.
Pointy-kun is the nickname given to this guy by Japanese fans. :D You can see why.
there really is a tape