Modemman, sometimes written Modem Man, is (or rather was) a rather unsucsessful web comic drawn by AdamTT available at www.liquidspin.com/modemman. It portrayed the life of a young boy (that is the artist himself) who struggled to survive in a world of broadband users, while he only had a 56k modem.
In the story, Modemman was more or less the final modem user in the world. At one point he was therefore put into a museum so that everybody could see how people of the modem tribe lived. Modemman did many other interesting things including playing NetHack, going to scout camp, going to Australia and trying to finish a download before somebody picked up the phone.
Appart from the main character, the story contained many other characters such as Stupid family member, Stalin, the snail, not Modemman and others.