Companion Cube/Fan Works

Examples of s in include:


 * Naruto the Abridged Series has "The Log" as Sasuke's invincible rival. In fact, the only creature who might have a shot at beating him is Clucky... who is a chicken! Also the "One-Foot-Tall Brick Wall" which was Naruto's response to The Log, though not a bitter rival so much as an occasional cameo sidekick and a way to keep Konohamaru and his tag-along buddies out of the story as much as possible.
 * And Kakashi has his milk carton from time to time. "Heh-heh...moo."
 * Ren and Stimpy had a commercial for "Log, from Whammo!"
 * Which is parodied in AMV Hell Championship Edition. With a Naruto connection, no less!
 * Yu-Gi-Oh!: The Abridged Series: "The Ocean and I are getting married."
 * May not count anymore, after all it
 * Ishizu has the giant rock. It's the only one who understands her.
 * Kyon: Big Damn Hero: Kyon has his PDA, which can learn. He calls it Skynet and talks to it more than once.
 * Aside from Shinji himself, the first recurring characters in Shinji and Warhammer40K were the four miniatures with whom Shinji has several character-building conversations (a Space Marine Captain, an Eldar Farseer, an Ork Warboss, and a Chaos Lord). Then they develop their own personalities against Shinji's will. Then he starts having conversations with them entirely in his mind. Then they develop their own independant existences, to the point where other characters have conversations with them (granted, those characters are Rei and Kaworu, who aren't exactly normal to begin with).
 * In The Official Fanfiction University of Middle-Earth, we have Toey the toe ring, BreadLegs and RollFeet.
 * In the My Little Pony: Friendship Is Magic fanfic Progress, Princess Luna is rather attached to an antique abacus; in one chapter, her maid Sundance claims that Luna made pajamas for it and reads it bedtime stories. It became popular for a while for writers of other fanfics, especially (but not limited to) more light-hearted ones, to depict Luna with an abacus companion.
 * Another fanfic had Applejack comment that accidentally tearing her Nice Hat felt like injuring a close friend.
 * In Harry Potter and the Methods of Rationality Harry doesn't want an owl, because of his past traumatic experience with pets, namely that his Pet Rock died.