Lenzo

Lenzo is the master of picture-taking in The Wind Waker. In his earlier days, he sailed throughout the Great Sea, taking pictures of mystical beings and strange sights, but he has now settled on Windfall Island. Lenzo has been studying pictographs and everything about them ever since he was young, so he possesses knowledge about Picto Boxes that no one else has. He also has a strange hobby of sneaking up behind people when they least expect it. When Link first meets him, Lenzo is reluctant to trust him due to the fact that one of his Picto Boxes was stolen from him by Tingle, and urges the young hero to leave. However, when Link shows him the Picto Box he found, the pictograph master urges him to look around his gallery upstairs, and even asks him to become his research assistant to develop a box with "incredible pictography capabilities".

After Link helps him with his research material, Lenzo will tell him that he is looking for a color pictograph box, which is capable of taking high quality, color images. If Link brings him a firefly from the Forest Haven, Lenzo will improve the young hero's Pictobox and make it so that it can take color pictures.

Lenzo also sells Legendary Pictographs, and Link can receive them by paying a fee of just 50 Rupees per photo.

Theory
Lenzo is possibly Link's grandfather. Upon inspecting a picture of Outset Island in Lenzo's photo gallery, Lenzo states that he once met a young lass a long time ago, and remarks that she is probably quite old. It is possible that he and Link's grandmother fell in love for a short time, and she gave birth to Link's father or mother.